From f000c9ff54018dfc3c907a25c2290a5e79bd7073 Mon Sep 17 00:00:00 2001
From: Tristan Simas <tristan.simas@mail.mcgill.ca>
Date: Mon, 5 Oct 2026 09:41:42 -0400
Subject: [PATCH 1/6] docs: scope original native damage span admission

---
 .../SCOPE.md                                  | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 evidence/native-damage-span-admission-20261005/SCOPE.md

diff --git a/evidence/native-damage-span-admission-20261005/SCOPE.md b/evidence/native-damage-span-admission-20261005/SCOPE.md
new file mode 100644
index 0000000000..683db16a79
--- /dev/null
+++ b/evidence/native-damage-span-admission-20261005/SCOPE.md
@@ -0,0 +1,24 @@
+# Keep original damage spans through native paint admission
+
+Source base: merged Text67 d7337ee084f6dcda42cbd8a41c7417e87d60ae78.
+
+`Compositor.render_partial_update` already owns exact nonoverlapping damaged
+horizontal spans. It passes only row membership into `_render_chops`, which
+allocates every cut on each dirty row inside the broad damage union. Separated
+horizontal damage therefore asks intervening foreground content to render;
+`ChopsUpdate` only removes that work later when publishing exact spans.
+
+Use the existing `ChopsUpdate` cut-boundary owner for both compositor admission
+and terminal / Rich publication. Carry original spans through every full,
+partial, inline/export and subtree-capture caller. Preserve layer order,
+wide-cell splitting, source metadata, clipping and exposure. Delete the
+row-only reduction and separate cut-selection calculation. No new map, cache,
+flag, timer, class, scene backend or Toad implementation.
+
+NRA/refactor-audit IMPL-12: one damage/cut relation calculated differently at
+paint admission and publication. AST before/after will cover all native and
+Toad production, test and tool callers, with parsing and dynamic limits explicit.
+
+Source reasoning and complete implementation precede proportionate affected
+controls. Installed saved-history motion/CPU improvement is unqualified. No
+build, environment, installed package, provider or recording purpose exists.

From 68a9755b411819090283f180a362bf7659757b01 Mon Sep 17 00:00:00 2001
From: Tristan Simas <tristan.simas@mail.mcgill.ca>
Date: Mon, 5 Oct 2026 09:44:07 -0400
Subject: [PATCH 2/6] perf: admit original damaged cut cells before native
 painting

---
 .../before.json                               | 1810 +++++++++++++++++
 src/textual/_compositor.py                    |   52 +-
 2 files changed, 1839 insertions(+), 23 deletions(-)
 create mode 100644 evidence/native-damage-span-admission-20261005/before.json

diff --git a/evidence/native-damage-span-admission-20261005/before.json b/evidence/native-damage-span-admission-20261005/before.json
new file mode 100644
index 0000000000..225f9609bd
--- /dev/null
+++ b/evidence/native-damage-span-admission-20261005/before.json
@@ -0,0 +1,1810 @@
+{
+  "roots": [
+    {
+      "repository": "/home/ts/wt/textual-native-subtree-strips-20261002",
+      "head": "f000c9ff54018dfc3c907a25c2290a5e79bd7073",
+      "root": "src/textual",
+      "parsed": 249,
+      "omitted": []
+    },
+    {
+      "repository": "/home/ts/wt/textual-native-subtree-strips-20261002",
+      "head": "f000c9ff54018dfc3c907a25c2290a5e79bd7073",
+      "root": "tests",
+      "parsed": 460,
+      "omitted": []
+    },
+    {
+      "repository": "/home/ts/wt/toad-viewport-raster-cpu-continuation-20261001",
+      "head": "83247c4b81834f42f308dbd01349a0c5795d49f8",
+      "root": "src/toad",
+      "parsed": 288,
+      "omitted": []
+    },
+    {
+      "repository": "/home/ts/wt/toad-viewport-raster-cpu-continuation-20261001",
+      "head": "83247c4b81834f42f308dbd01349a0c5795d49f8",
+      "root": "tests",
+      "parsed": 397,
+      "omitted": []
+    },
+    {
+      "repository": "/home/ts/wt/toad-viewport-raster-cpu-continuation-20261001",
+      "head": "83247c4b81834f42f308dbd01349a0c5795d49f8",
+      "root": "tools",
+      "parsed": 41,
+      "omitted": []
+    }
+  ],
+  "sites": [
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 435,
+      "node": "ClassDef",
+      "name": "ChopsUpdate",
+      "source": "class ChopsUpdate(CompositorUpdate):"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 455,
+      "node": "FunctionDef",
+      "name": "_get_line_chops",
+      "source": "    def _get_line_chops(self, y: int, x1: int, x2: int) -> Iterator[tuple[int, Strip]]:"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 615,
+      "node": "FunctionDef",
+      "name": "_regions_to_spans",
+      "source": "    def _regions_to_spans("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1440,
+      "node": "FunctionDef",
+      "name": "_get_renders",
+      "source": "    def _get_renders("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1535,
+      "node": "FunctionDef",
+      "name": "render_full_update",
+      "source": "    def render_full_update(self, simplify: bool = False) -> LayoutUpdate:"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1562,
+      "node": "FunctionDef",
+      "name": "render_partial_update",
+      "source": "    def render_partial_update(self) -> ChopsUpdate | None:"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1584,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips(self, size: Size | None = None) -> list[Strip]:"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1617,
+      "node": "FunctionDef",
+      "name": "render_subtree_strips",
+      "source": "    def render_subtree_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1639,
+      "node": "FunctionDef",
+      "name": "_render_chops",
+      "source": "    def _render_chops("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1550,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1562,
+      "node": "Name",
+      "name": "ChopsUpdate",
+      "source": "ChopsUpdate"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1598,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1599,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1532,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self.render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1547,
+      "node": "Attribute",
+      "name": "_render_chops",
+      "source": "self._render_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1554,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1558,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1560,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1579,
+      "node": "Attribute",
+      "name": "_render_chops",
+      "source": "self._render_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1582,
+      "node": "Name",
+      "name": "ChopsUpdate",
+      "source": "ChopsUpdate"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1595,
+      "node": "Attribute",
+      "name": "_render_chops",
+      "source": "self._render_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1704,
+      "node": "Attribute",
+      "name": "_get_renders",
+      "source": "self._get_renders"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 480,
+      "node": "Attribute",
+      "name": "_get_line_chops",
+      "source": "self._get_line_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 503,
+      "node": "Attribute",
+      "name": "_get_line_chops",
+      "source": "self._get_line_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1511,
+      "node": "Attribute",
+      "name": "render_full_update",
+      "source": "self.render_full_update"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1513,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "self.render_partial_update"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1576,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "self._regions_to_spans"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1635,
+      "node": "Attribute",
+      "name": "_render_chops",
+      "source": "self._render_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1728,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self.render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/content.py",
+      "line": 728,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/renderables/blank.py",
+      "line": 27,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/visual.py",
+      "line": 131,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/visual.py",
+      "line": 324,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/visual.py",
+      "line": 391,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/visual.py",
+      "line": 227,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "visual.render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/visual.py",
+      "line": 411,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self._visual.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/frame_damage_installed_pilot.py",
+      "line": 16,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 390,
+      "node": "Attribute",
+      "name": "_get_renders",
+      "source": "compositor._get_renders"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 310,
+      "node": "Attribute",
+      "name": "_get_renders",
+      "source": "compositor._get_renders"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 354,
+      "node": "Attribute",
+      "name": "_get_renders",
+      "source": "compositor._get_renders"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 388,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 308,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 349,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 392,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 313,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 357,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 76,
+      "node": "Name",
+      "name": "ChopsUpdate",
+      "source": "ChopsUpdate"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 17,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 58,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 103,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 124,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 144,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_horizontal_damage.py",
+      "line": 50,
+      "node": "Attribute",
+      "name": "_get_renders",
+      "source": "compositor._get_renders"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_horizontal_damage.py",
+      "line": 46,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_horizontal_damage.py",
+      "line": 52,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 6,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 11,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 19,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 28,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 37,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 42,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 51,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_content.py",
+      "line": 303,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "content.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_frame_transaction.py",
+      "line": 19,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 146,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 168,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "owner._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 197,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "owner._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 228,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "owner._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 178,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "owner._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 209,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "owner._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 123,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 240,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 271,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 281,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 166,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 171,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_layout.py",
+      "line": 22,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/toad_frame_damage_installed_pilot.py",
+      "line": 33,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self.screen._compositor.render_strips"
+    },
+    {
+      "root": "src/toad",
+      "path": "src/toad/visuals/columns.py",
+      "line": 44,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/toad",
+      "path": "src/toad/widgets/conversation.py",
+      "line": 2129,
+      "node": "Attribute",
+      "name": "render_full_update",
+      "source": "compositor.render_full_update"
+    },
+    {
+      "root": "src/toad",
+      "path": "src/toad/widgets/patch_diff.py",
+      "line": 245,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips(self, width, height, style, options):"
+    },
+    {
+      "root": "src/toad",
+      "path": "src/toad/widgets/patch_diff.py",
+      "line": 339,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "row.render_strips"
+    },
+    {
+      "root": "src/toad",
+      "path": "src/toad/widgets/patch_diff.py",
+      "line": 367,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "_DiffRow(self.source, y).render_strips"
+    },
+    {
+      "root": "src/toad",
+      "path": "src/toad/widgets/path_search.py",
+      "line": 46,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/toad",
+      "path": "src/toad/widgets/prepared_markdown.py",
+      "line": 144,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/toad",
+      "path": "src/toad/widgets/prepared_markdown.py",
+      "line": 155,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self.content.render_strips"
+    },
+    {
+      "root": "src/toad",
+      "path": "src/toad/widgets/throbber.py",
+      "line": 63,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/toad",
+      "path": "src/toad/widgets/viewport_body.py",
+      "line": 649,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/acp_specification_installed_pilot.py",
+      "line": 24,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/agent_configuration_native_installed_pilot.py",
+      "line": 45,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/agent_selection_configured_installed_pilot.py",
+      "line": 194,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.workspace_screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/agent_startup_failure_installed_pilot.py",
+      "line": 49,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/agent_startup_failure_installed_pilot.py",
+      "line": 54,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/async_thread_open_pilot.py",
+      "line": 108,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/async_thread_open_pilot.py",
+      "line": 168,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/blank_presentation_pilot.py",
+      "line": 381,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/blank_presentation_pilot.py",
+      "line": 572,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/blank_presentation_pilot.py",
+      "line": 293,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/block_interaction_pilot.py",
+      "line": 33,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/canonical_wire_conversation_installed_pilot.py",
+      "line": 264,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/catalog_actions_native_installed_pilot.py",
+      "line": 88,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/channel_disclosure_publication_pilot.py",
+      "line": 235,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/channel_partial_paint_pilot.py",
+      "line": 75,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/checkpoint_source_pivot_pilot.py",
+      "line": 92,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
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+      "path": "tests/client_session_native_installed_pilot.py",
+      "line": 50,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/client_session_native_installed_pilot.py",
+      "line": 49,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
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+      "path": "tests/client_session_native_installed_pilot.py",
+      "line": 61,
+      "node": "Attribute",
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+      "source": "app.screen._compositor.render_strips"
+    },
+    {
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+      "path": "tests/client_session_native_installed_pilot.py",
+      "line": 74,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
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+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
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+      "path": "tests/command_family_pilot.py",
+      "line": 62,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/command_family_pilot.py",
+      "line": 130,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
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+      "path": "tests/compaction_pilot.py",
+      "line": 77,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
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+      "line": 30,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self.screen._compositor.render_strips"
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+    {
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+      "source": "app.screen._compositor.render_strips"
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+      "node": "Attribute",
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+    {
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+      "node": "Attribute",
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+      "source": "app.screen._compositor.render_strips"
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "source": "visual.render_strips"
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+    {
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+      "line": 39,
+      "node": "Attribute",
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+      "source": "_DiffRow(visual, y).render_strips"
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+      "node": "Attribute",
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+      "node": "Attribute",
+      "name": "render_strips",
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "source": "app.screen._compositor.render_strips"
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "node": "Attribute",
+      "name": "render_strips",
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+    {
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "node": "Attribute",
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+      "source": "app.screen._compositor.render_strips"
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+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/large_stream_pilot.py",
+      "line": 70,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/long_message_pilot.py",
+      "line": 49,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/long_message_pilot.py",
+      "line": 52,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/long_message_pilot.py",
+      "line": 56,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/mcp_decision_pty_pilot.py",
+      "line": 34,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "widget.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/message_dividers_pilot.py",
+      "line": 336,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/native_loaded_return_cache_pilot.py",
+      "line": 64,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/native_loaded_return_cache_pilot.py",
+      "line": 459,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "frame._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/native_loaded_return_cache_pilot.py",
+      "line": 244,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/native_permission_ui.py",
+      "line": 70,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self.app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/native_permission_ui.py",
+      "line": 80,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self.app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/native_session_retention_pilot.py",
+      "line": 91,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/native_session_retention_pilot.py",
+      "line": 53,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/native_tool_output_pilot.py",
+      "line": 46,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/native_widget_actions_installed_pilot.py",
+      "line": 30,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/original_turn_resource_real_installed_pilot.py",
+      "line": 249,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/pending_thread_open_pilot.py",
+      "line": 52,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/permission_pending_mount_pilot.py",
+      "line": 112,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/permission_pending_mount_pilot.py",
+      "line": 75,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/persistent_workspace_source_navigation_pilot.py",
+      "line": 58,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "frame._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/prepared_diff_rows_pilot.py",
+      "line": 55,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "_DiffRow(visual, 0).render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/quit_save_installed_pilot.py",
+      "line": 20,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/reader_geometry_pilot.py",
+      "line": 30,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/readonly_saved_reader_pilot.py",
+      "line": 53,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/receiver_inbound_installed_pilot.py",
+      "line": 16,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/reconnect_source_native_installed_pilot.py",
+      "line": 50,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/resize_render_pilot.py",
+      "line": 39,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/resize_render_pilot.py",
+      "line": 51,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/retained_fragment_geometry_pilot.py",
+      "line": 212,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "scene.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/retained_fragment_geometry_pilot.py",
+      "line": 138,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "scene.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/retained_input_origin_observer.py",
+      "line": 131,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self.app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/saved_state_user_journey_pilot.py",
+      "line": 161,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/session_details_pilot.py",
+      "line": 51,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/session_details_pilot.py",
+      "line": 102,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/session_route_installed_pilot.py",
+      "line": 51,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/sidebar_navigation_pilot.py",
+      "line": 38,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/sidebar_retirement_pilot.py",
+      "line": 61,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "widget.screen.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/tab_history_controls_pilot.py",
+      "line": 26,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/tab_history_controls_pilot.py",
+      "line": 87,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/tab_scrollbar_top_pilot.py",
+      "line": 63,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/tab_scrollbar_top_pilot.py",
+      "line": 121,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/terminal_attention_installed_journey.py",
+      "line": 142,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/terminal_attention_installed_journey.py",
+      "line": 163,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/terminal_attention_installed_journey.py",
+      "line": 212,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/thread_activation_pilot.py",
+      "line": 38,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/thread_navigation_installed_journey.py",
+      "line": 122,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/thread_navigation_installed_journey.py",
+      "line": 150,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/thread_navigation_installed_journey.py",
+      "line": 163,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/throbber_render_cache_pilot.py",
+      "line": 40,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "visual.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/throbber_render_cache_pilot.py",
+      "line": 44,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "ThrobberVisual(get_time=lambda value=clock: value).render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/tool_diff_lifecycle_pilot.py",
+      "line": 32,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/tool_diff_pilot.py",
+      "line": 42,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/transcript_filter_installed_journey.py",
+      "line": 83,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/transcript_history_pilot.py",
+      "line": 136,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/transcript_history_pilot.py",
+      "line": 73,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/viewport_body_order_pilot.py",
+      "line": 447,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/viewport_layout_reentry_pilot.py",
+      "line": 69,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/viewport_rapid_scroll_pilot.py",
+      "line": 82,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/worker_native_size_pilot.py",
+      "line": 160,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "scene.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/worker_preview_pilot.py",
+      "line": 99,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/worker_preview_pilot.py",
+      "line": 111,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/worker_preview_pilot.py",
+      "line": 133,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    }
+  ],
+  "limits": "Syntactic declarations, name and attribute consumers; arbitrary dynamic rebinding and external third-party private API calls are not resolved."
+}
diff --git a/src/textual/_compositor.py b/src/textual/_compositor.py
index f01879ef40..d0a851c829 100644
--- a/src/textual/_compositor.py
+++ b/src/textual/_compositor.py
@@ -452,17 +452,29 @@ def __init__(
         self.spans = spans
         self.cuts = cuts
 
+    @staticmethod
+    def _span_cuts(
+        spans: Iterable[tuple[int, int, int]], cuts: list[list[int]], y_origin: int,
+    ) -> Iterator[tuple[int, int, int]]:
+        """Select original cut cells touched by damage, including wide edges.
+
+        Paint admission and both publication formats use the same cells. A
+        span inside a cell still requires that whole strip before final crop.
+        """
+        for y, x1, x2 in spans:
+            line_cuts = cuts[y - y_origin]
+            first = max(0, bisect_right(line_cuts, x1) - 1)
+            last = bisect_left(line_cuts, x2)
+            for index in range(first, last):
+                yield y, line_cuts[index], line_cuts[index + 1]
+
     def _get_line_chops(self, y: int, x1: int, x2: int) -> Iterator[tuple[int, Strip]]:
         """Clip the original painted chops once for either publication format.
 
         Strip owns cell splitting, including wide characters and metadata.
         Borrow the original cuts instead of copying ends for every screen row.
         """
-        cuts = self.cuts[y]
-        first = max(0, bisect_right(cuts, x1) - 1)
-        last = bisect_left(cuts, x2)
-        for index in range(first, last):
-            x, end = cuts[index], cuts[index + 1]
+        for _, x, end in self._span_cuts(((y, x1, x2),), self.cuts, 0):
             strip = self.chops[y].get(x)
             if strip is None:
                 continue
@@ -1544,7 +1556,7 @@ def render_full_update(self, simplify: bool = False) -> LayoutUpdate:
         screen_region = self.size.region
         self._dirty_regions.clear()
         crop = screen_region
-        chops = self._render_chops(crop, lambda y: True,
+        chops = self._render_chops(crop, self._regions_to_spans((screen_region,)),
                                   widgets=self.visible_widgets, cuts=self.cuts,
                                   bounds=screen_region)
         render_strips: list[Iterable[Strip]]
@@ -1574,9 +1586,8 @@ def render_partial_update(self) -> ChopsUpdate | None:
             return None
         crop = Region.from_union(update_regions)
         spans = list(self._regions_to_spans(update_regions))
-        is_rendered_line = {y for y, _, _ in spans}.__contains__
         cuts = self.cuts
-        chops = self._render_chops(crop, is_rendered_line,
+        chops = self._render_chops(crop, spans,
                                   widgets=self.visible_widgets, cuts=cuts,
                                   bounds=screen_region)
         return ChopsUpdate(chops, spans, cuts)
@@ -1592,7 +1603,8 @@ def render_strips(self, size: Size | None = None) -> list[Strip]:
         """
         if size is None:
             size = self.size
-        chops = self._render_chops(size.region, lambda y: True,
+        rows = Region(0, 0, self.size.width, min(size.height, self.size.height))
+        chops = self._render_chops(size.region, self._regions_to_spans((rows,)),
                                   widgets=self.visible_widgets, cuts=self.cuts,
                                   bounds=self.size.region)
         render_strips = [Strip.join(chop.values()) for chop in chops[: size.height]]
@@ -1632,14 +1644,14 @@ def render_subtree_strips(
         widgets = self._paint_regions(self._ordered_geometry(geometry), bounds)
         cuts = self._cuts_for_regions(bounds, widgets)
         with self._using_geometry(root, geometry):
-            chops = self._render_chops(bounds, lambda y: True,
+            chops = self._render_chops(bounds, self._regions_to_spans((bounds,)),
                                       widgets=widgets, cuts=cuts, bounds=bounds)
         return bounds.size, [Strip.join(chop.values()) for chop in chops]
 
     def _render_chops(
         self,
         crop: Region,
-        is_rendered_line: Callable[[int], bool],
+        spans: Iterable[tuple[int, int, int]],
         *, widgets: Mapping[Widget, tuple[Region, Region]], cuts: list[list[int]],
         bounds: Region,
     ) -> Sequence[Mapping[int, Strip]]:
@@ -1647,19 +1659,15 @@ def _render_chops(
 
         Args:
             crop: Region to crop to.
-            is_rendered_line: Callable to check if line should be rendered.
+            spans: Original damaged horizontal spans to admit before painting.
             bounds: Original screen or body bounds represented by the chops.
 
         Returns:
             Chops structure.
         """
-        fromkeys = cast("Callable[[list[int]], dict[int, Strip | None]]", dict.fromkeys)
-        chops: list[dict[int, Strip | None]]
-        chops = [
-            fromkeys(cut_set[:-1])
-            if crop.y <= y < crop.bottom and is_rendered_line(y) else {}
-            for y, cut_set in enumerate(cuts, bounds.y)
-        ]
+        chops: list[dict[int, Strip | None]] = [{} for _ in cuts]
+        for y, x, _end in ChopsUpdate._span_cuts(spans, cuts, bounds.y):
+            chops[y - bounds.y][x] = None
         remaining = [len(line) for line in chops]
 
         def render_regions(region: Region) -> Iterable[Region]:
@@ -1679,8 +1687,7 @@ def render_regions(region: Region) -> Iterable[Region]:
                     row_cuts = cuts[row]
                     for index in range(bisect_left(row_cuts, first), bisect_left(row_cuts, last)):
                         x = row_cuts[index]
-                        value = chops[row][x]
-                        if value is None:
+                        if x in chops[row] and chops[row][x] is None:
                             if start_x is None:
                                 start_x = x
                         elif start_x is not None:
@@ -1717,9 +1724,8 @@ def render_regions(region: Region) -> Iterable[Region]:
                 cut_strips = strip.divide([cut - render_x for cut in final_cuts[1:]])
 
                 # Since we are painting front to back, the first segments for a cut "wins"
-                get_chops_line = chops_line.get
                 for cut, strip in zip(final_cuts, cut_strips):
-                    if get_chops_line(cut) is None:
+                    if cut in chops_line and chops_line[cut] is None:
                         chops_line[cut] = strip
                         remaining[row] -= 1
         return cast("Sequence[Mapping[int, Strip]]", chops)

From 4b5076efbd4c6f02fa53990e082fee96ed530a07 Mon Sep 17 00:00:00 2001
From: Tristan Simas <tristan.simas@mail.mcgill.ca>
Date: Mon, 5 Oct 2026 09:46:26 -0400
Subject: [PATCH 3/6] test: cover native damage islands without intervening
 paint

---
 tests/test_compositor_frame_damage.py | 54 +++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/tests/test_compositor_frame_damage.py b/tests/test_compositor_frame_damage.py
index 37411ef4fc..bee5b505d5 100644
--- a/tests/test_compositor_frame_damage.py
+++ b/tests/test_compositor_frame_damage.py
@@ -107,6 +107,60 @@ def compose(self):
         assert "".join(segment.text for segment in segments if not segment.control) == "CDE\nEF"
 
 
+@pytest.mark.parametrize('regions', [
+    ((2, 0, 3, 1), (22, 0, 3, 1)),
+    ((1, 0, 2, 1), (2, 0, 3, 1), (21, 2, 2, 1)),
+])
+async def test_horizontal_damage_keeps_intervening_native_content_unpainted(regions):
+    """Damage islands must not materialize the unchanged pane between them."""
+    from rich.control import Control
+    from textual.geometry import Region
+
+    class Counted(Static):
+        def __init__(self, **kwargs):
+            super().__init__("[link=https://example.com]A界BCDEFGH[/link]\nSECOND\nTHIRD", **kwargs)
+            self.crops = []
+
+        def render_lines(self, crop):
+            self.crops.append(crop)
+            return super().render_lines(crop)
+
+    class IslandsApp(App):
+        CSS = "Screen { layout: horizontal; } Counted { width: 10; height: 3; }"
+
+        def compose(self):
+            for name in ('left', 'middle', 'right'):
+                yield Counted(id=name)
+
+    app = IslandsApp()
+    async with app.run_test(size=(30, 5)) as pilot:
+        await pilot.pause()
+        compositor = app.screen._compositor
+        reference = compositor.render_strips()
+        panes = [app.query_one(f'#{name}', Counted) for name in ('left', 'middle', 'right')]
+        for pane in panes:
+            pane.crops.clear()
+        compositor._dirty_regions = {Region(*region) for region in regions}
+        update = compositor.render_partial_update()
+        assert update is not None
+        assert panes[0].crops and panes[2].crops
+        assert panes[1].crops == []
+        assert all(not region.translate(pane.region.offset).overlaps(panes[1].region)
+                   for pane in (panes[0], panes[2]) for region in pane.crops)
+
+        expected = []
+        for y, x1, x2 in update.spans:
+            painted = list(update._get_line_chops(y, x1, x2))
+            assert len(painted) == 1
+            x, strip = painted[0]
+            assert x == x1
+            assert strip == reference[y].crop(x1, x2)
+            expected.append(Control.move_to(x1, y).segment.text + strip.render(app.console))
+            if y != update.spans[-1][0]:
+                expected.append('\n')
+        assert update.render_segments(app.console) == ''.join(expected)
+
+
 async def test_body_capture_keeps_original_nonzero_row_coordinates():
     class BodyApp(App):
         CSS = "#body { width: 12; height: 3; offset: 5 4; }"

From 8c4cb3563ae7dc14e84e87edccdd627f583e05d5 Mon Sep 17 00:00:00 2001
From: Tristan Simas <tristan.simas@mail.mcgill.ca>
Date: Mon, 5 Oct 2026 09:48:00 -0400
Subject: [PATCH 4/6] docs: bind complete native damage consumer closure

---
 .../SCOPE.md                                  |  42 +
 .../after.json                                | 726 ++++++++++++++++++
 2 files changed, 768 insertions(+)
 create mode 100644 evidence/native-damage-span-admission-20261005/after.json

diff --git a/evidence/native-damage-span-admission-20261005/SCOPE.md b/evidence/native-damage-span-admission-20261005/SCOPE.md
index 683db16a79..6fd5cf8e0c 100644
--- a/evidence/native-damage-span-admission-20261005/SCOPE.md
+++ b/evidence/native-damage-span-admission-20261005/SCOPE.md
@@ -22,3 +22,45 @@ Toad production, test and tool callers, with parsing and dynamic limits explicit
 Source reasoning and complete implementation precede proportionate affected
 controls. Installed saved-history motion/CPU improvement is unqualified. No
 build, environment, installed package, provider or recording purpose exists.
+
+## Working checkpoint
+
+Production: 68a9755b411819090283f180a362bf7659757b01.
+Authored affected App controls: 4b5076efbd4c6f02fa53990e082fee96ed530a07.
+One production file: 29 added / 23 deleted lines against merged Text67.
+
+- `ChopsUpdate._span_cuts` is the sole damaged-span/cut-cell selector.
+  The original Unicode-aware Strip crop remains at final publication.
+- `Compositor._render_chops` admits those original cells before exposure and
+  `Widget.render_lines`; both exposure and strip assignment retain membership
+  in that same admitted chop resource.
+- All four callers migrate: full update, partial update, render_strips (inline /
+  export), and nonzero/negative-origin subtree capture. Full capture and ordinary
+  full update still admit their complete bounds. render_strips retains the
+  original scene row limit when a requested size exceeds the published scene.
+- Deleted the damaged-row predicate and the separate terminal cut-selection
+  algorithm. The existing geometry/cut maps and front-to-back order are intact.
+
+`before.json` covers native production249/tests460 and Toad
+production288/tests397/tools41, all parse omissions0. `after.json` covers the
+changed native production249/tests460, omissions0; unmodified dependency
+consumer evidence is retained at its original pinned source. Four render-chop
+callers, one span-cut declaration, zero old dirty-row predicates. Syntactic AST
+queries do not prove arbitrary runtime rebinding or unregistered external
+private-method consumers.
+
+## Remaining qualification
+
+Source-only / Draft. The new actual-native App controls are authored but UNRUN.
+They check that horizontal damage islands do not render the intervening pane,
+with output parity against the same scene's full strips, including mid-wide-cell
+edges, links and disjoint / overlapping damaged rows. Existing frame resize,
+partial vertical redraw, layered exposure and original subtree-coordinate
+controls cover the other changed callers. One final bounded affected family
+batch is sufficient; accepted Text67 controls are not part of it.
+
+No installed prefix, wheel, UI movie, provider or public mutation was attempted.
+No causal CPU gain, measured cadence, smoothness or whole-workflow readiness is
+claimed. All scene members are still walked to select layered candidates, and
+full-frame cut construction cost is unmeasured; this removes unnecessary content
+painting, not those legitimate traversal/geometry operations.
diff --git a/evidence/native-damage-span-admission-20261005/after.json b/evidence/native-damage-span-admission-20261005/after.json
new file mode 100644
index 0000000000..d1d991626c
--- /dev/null
+++ b/evidence/native-damage-span-admission-20261005/after.json
@@ -0,0 +1,726 @@
+{
+  "roots": [
+    {
+      "repository": "/home/ts/wt/textual-native-subtree-strips-20261002",
+      "head": "4b5076efbd4c6f02fa53990e082fee96ed530a07",
+      "root": "src/textual",
+      "parsed": 249,
+      "omitted": []
+    },
+    {
+      "repository": "/home/ts/wt/textual-native-subtree-strips-20261002",
+      "head": "4b5076efbd4c6f02fa53990e082fee96ed530a07",
+      "root": "tests",
+      "parsed": 460,
+      "omitted": []
+    }
+  ],
+  "sites": [
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 435,
+      "node": "ClassDef",
+      "name": "ChopsUpdate",
+      "source": "class ChopsUpdate(CompositorUpdate):"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 456,
+      "node": "FunctionDef",
+      "name": "_span_cuts",
+      "source": "    def _span_cuts("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 471,
+      "node": "FunctionDef",
+      "name": "_get_line_chops",
+      "source": "    def _get_line_chops(self, y: int, x1: int, x2: int) -> Iterator[tuple[int, Strip]]:"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 627,
+      "node": "FunctionDef",
+      "name": "_regions_to_spans",
+      "source": "    def _regions_to_spans("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1452,
+      "node": "FunctionDef",
+      "name": "_get_renders",
+      "source": "    def _get_renders("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1547,
+      "node": "FunctionDef",
+      "name": "render_full_update",
+      "source": "    def render_full_update(self, simplify: bool = False) -> LayoutUpdate:"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1574,
+      "node": "FunctionDef",
+      "name": "render_partial_update",
+      "source": "    def render_partial_update(self) -> ChopsUpdate | None:"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1595,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips(self, size: Size | None = None) -> list[Strip]:"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1629,
+      "node": "FunctionDef",
+      "name": "render_subtree_strips",
+      "source": "    def render_subtree_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1651,
+      "node": "FunctionDef",
+      "name": "_render_chops",
+      "source": "    def _render_chops("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1562,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1574,
+      "node": "Name",
+      "name": "ChopsUpdate",
+      "source": "ChopsUpdate"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1610,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1611,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 477,
+      "node": "Attribute",
+      "name": "_span_cuts",
+      "source": "self._span_cuts"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1544,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self.render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1559,
+      "node": "Attribute",
+      "name": "_render_chops",
+      "source": "self._render_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1566,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1570,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1572,
+      "node": "Name",
+      "name": "render_strips",
+      "source": "render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1590,
+      "node": "Attribute",
+      "name": "_render_chops",
+      "source": "self._render_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1593,
+      "node": "Name",
+      "name": "ChopsUpdate",
+      "source": "ChopsUpdate"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1607,
+      "node": "Attribute",
+      "name": "_render_chops",
+      "source": "self._render_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1669,
+      "node": "Attribute",
+      "name": "_span_cuts",
+      "source": "ChopsUpdate._span_cuts"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1711,
+      "node": "Attribute",
+      "name": "_get_renders",
+      "source": "self._get_renders"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 492,
+      "node": "Attribute",
+      "name": "_get_line_chops",
+      "source": "self._get_line_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 515,
+      "node": "Attribute",
+      "name": "_get_line_chops",
+      "source": "self._get_line_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1523,
+      "node": "Attribute",
+      "name": "render_full_update",
+      "source": "self.render_full_update"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1525,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "self.render_partial_update"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1559,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "self._regions_to_spans"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1588,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "self._regions_to_spans"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1607,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "self._regions_to_spans"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1647,
+      "node": "Attribute",
+      "name": "_render_chops",
+      "source": "self._render_chops"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1669,
+      "node": "Name",
+      "name": "ChopsUpdate",
+      "source": "ChopsUpdate"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1734,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self.render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/_compositor.py",
+      "line": 1647,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "self._regions_to_spans"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/content.py",
+      "line": 728,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/renderables/blank.py",
+      "line": 27,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/visual.py",
+      "line": 131,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/visual.py",
+      "line": 324,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/visual.py",
+      "line": 391,
+      "node": "FunctionDef",
+      "name": "render_strips",
+      "source": "    def render_strips("
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/visual.py",
+      "line": 227,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "visual.render_strips"
+    },
+    {
+      "root": "src/textual",
+      "path": "src/textual/visual.py",
+      "line": 411,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self._visual.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/frame_damage_installed_pilot.py",
+      "line": 16,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 390,
+      "node": "Attribute",
+      "name": "_get_renders",
+      "source": "compositor._get_renders"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 310,
+      "node": "Attribute",
+      "name": "_get_renders",
+      "source": "compositor._get_renders"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 354,
+      "node": "Attribute",
+      "name": "_get_renders",
+      "source": "compositor._get_renders"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 388,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 308,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 349,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 392,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 313,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor.py",
+      "line": 357,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 76,
+      "node": "Name",
+      "name": "ChopsUpdate",
+      "source": "ChopsUpdate"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 17,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 58,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 103,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 139,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 144,
+      "node": "Attribute",
+      "name": "render_partial_update",
+      "source": "compositor.render_partial_update"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 178,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 198,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_frame_damage.py",
+      "line": 153,
+      "node": "Attribute",
+      "name": "_get_line_chops",
+      "source": "update._get_line_chops"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_horizontal_damage.py",
+      "line": 50,
+      "node": "Attribute",
+      "name": "_get_renders",
+      "source": "compositor._get_renders"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_horizontal_damage.py",
+      "line": 46,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_horizontal_damage.py",
+      "line": 52,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 6,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 11,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 19,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 28,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 37,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 42,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_compositor_regions_to_spans.py",
+      "line": 51,
+      "node": "Attribute",
+      "name": "_regions_to_spans",
+      "source": "Compositor._regions_to_spans"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_content.py",
+      "line": 303,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "content.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_frame_transaction.py",
+      "line": 19,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 146,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "app.screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 168,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "owner._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 197,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "owner._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 228,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "owner._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 178,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "owner._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_removed_scene_ownership.py",
+      "line": 209,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "owner._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 123,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 240,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 271,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 281,
+      "node": "Attribute",
+      "name": "render_subtree_strips",
+      "source": "compositor.render_subtree_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 166,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_geometry_targets.py",
+      "line": 171,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/test_viewport_layout.py",
+      "line": 22,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "screen._compositor.render_strips"
+    },
+    {
+      "root": "tests",
+      "path": "tests/toad_frame_damage_installed_pilot.py",
+      "line": 33,
+      "node": "Attribute",
+      "name": "render_strips",
+      "source": "self.screen._compositor.render_strips"
+    }
+  ],
+  "limits": "Syntactic declarations, name and attribute consumers; arbitrary dynamic rebinding and external third-party private API calls are not resolved.",
+  "retained_dependency_evidence": "before.json records pinned Toad production/tests/tools. No direct Toad _render_chops consumer; no changed Toad files in this branch."
+}

From 51f1971c2ea29b443ef15764036fa54b3de51c25 Mon Sep 17 00:00:00 2001
From: Tristan Simas <tristan.simas@mail.mcgill.ca>
Date: Mon, 5 Oct 2026 09:53:39 -0400
Subject: [PATCH 5/6] test: use declared native quoted link markup

---
 tests/test_compositor_frame_damage.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/test_compositor_frame_damage.py b/tests/test_compositor_frame_damage.py
index bee5b505d5..e85532fc4a 100644
--- a/tests/test_compositor_frame_damage.py
+++ b/tests/test_compositor_frame_damage.py
@@ -118,7 +118,7 @@ async def test_horizontal_damage_keeps_intervening_native_content_unpainted(regi
 
     class Counted(Static):
         def __init__(self, **kwargs):
-            super().__init__("[link=https://example.com]A界BCDEFGH[/link]\nSECOND\nTHIRD", **kwargs)
+            super().__init__("[link='https://example.com']A界BCDEFGH[/link]\nSECOND\nTHIRD", **kwargs)
             self.crops = []
 
         def render_lines(self, crop):

From d9c8480586495133d68cb763951100a2940c438e Mon Sep 17 00:00:00 2001
From: Tristan Simas <tristan.simas@mail.mcgill.ca>
Date: Mon, 5 Oct 2026 09:55:12 -0400
Subject: [PATCH 6/6] docs: qualify original damage admission and preserve
 markup negative

---
 .../SCOPE.md                                  |   37 +-
 .../source-batch01.json                       |   22 +
 .../source-batch01.log                        | 1000 +++++++++++++++++
 .../source-batch02.json                       |   18 +
 .../source-batch02.log                        |    2 +
 5 files changed, 1075 insertions(+), 4 deletions(-)
 create mode 100644 evidence/native-damage-span-admission-20261005/source-batch01.json
 create mode 100644 evidence/native-damage-span-admission-20261005/source-batch01.log
 create mode 100644 evidence/native-damage-span-admission-20261005/source-batch02.json
 create mode 100644 evidence/native-damage-span-admission-20261005/source-batch02.log

diff --git a/evidence/native-damage-span-admission-20261005/SCOPE.md b/evidence/native-damage-span-admission-20261005/SCOPE.md
index 6fd5cf8e0c..672be5a610 100644
--- a/evidence/native-damage-span-admission-20261005/SCOPE.md
+++ b/evidence/native-damage-span-admission-20261005/SCOPE.md
@@ -51,16 +51,45 @@ private-method consumers.
 
 ## Remaining qualification
 
-Source-only / Draft. The new actual-native App controls are authored but UNRUN.
-They check that horizontal damage islands do not render the intervening pane,
+Native source App scope qualified / Draft; installed behavior unqualified.
+The actual-native App controls check that horizontal damage islands do not render the intervening pane,
 with output parity against the same scene's full strips, including mid-wide-cell
 edges, links and disjoint / overlapping damaged rows. Existing frame resize,
 partial vertical redraw, layered exposure and original subtree-coordinate
-controls cover the other changed callers. One final bounded affected family
-batch is sufficient; accepted Text67 controls are not part of it.
+controls cover the other changed callers. The authorized final bounded batch ran once; accepted Text67 controls were not
+part of it. Only two invalid-markup fixture cases were corrected and rerun.
 
 No installed prefix, wheel, UI movie, provider or public mutation was attempted.
 No causal CPU gain, measured cadence, smoothness or whole-workflow readiness is
 claimed. All scene members are still walked to select layered candidates, and
 full-frame cut construction cost is unmeasured; this removes unnecessary content
 painting, not those legitimate traversal/geometry operations.
+
+## Actual source App qualification
+
+- Batch01 source8c4cb3563ae7dc14e84e87edccdd627f583e05d5:
+  14 PASS / 2 FAIL in4.19s, controller5.798375586979091s, exit1.
+  Both failures occurred at App startup because the authored link markup used
+  an unquoted URL, contrary to native Content markup. Original full failure log
+  and source are retained; no damage assertion ran in those two cases.
+- Correction51f1971c2ea29b443ef15764036fa54b3de51c25 changes ONLY that
+  fixture literal to the existing quoted native link declaration. No product
+  bytes or assertions changed. Only those two cases ran: 2 PASS in0.40s,
+  controller1.6918718189699575s, exit0.
+- Thus16 affected cases are qualified across the original batch plus the two
+  corrected cases; this is not a claim of one clean16-case run. Exact production
+  remains68a9755b411819090283f180a362bf7659757b01.
+- Damage islands left the middle native pane unrendered; resulting emitted
+  strips match the same full scene, including link metadata, mid-wide-cell
+  damage, overlap and differing selected rows. Existing partial vertical,
+  layered exposure, resize/old-caption damage, native writer crop, and subtree
+  original-coordinate/capture custody controls also passed.
+
+`source-batch01/02.json` bind their original logs by SHA. Resource readback
+reported10.7GiB available RAM and17.0GiB swap; this was one short sequential
+source batch and its two corrected cases, without a new environment or native
+process/package/SDK/media purpose. No accepted Text67/66 controls were repeated.
+
+Remaining boundary: normal standalone artifact and joined installed saved
+workflow acceptance. No source App control measures CPU, first paint cadence,
+physical input/frame latency, smoothness,144Hz or a global performance gain.
diff --git a/evidence/native-damage-span-admission-20261005/source-batch01.json b/evidence/native-damage-span-admission-20261005/source-batch01.json
new file mode 100644
index 0000000000..c031620dd3
--- /dev/null
+++ b/evidence/native-damage-span-admission-20261005/source-batch01.json
@@ -0,0 +1,22 @@
+{
+  "source": "8c4cb3563ae7dc14e84e87edccdd627f583e05d5",
+  "production_source": "68a9755b411819090283f180a362bf7659757b01",
+  "argv": [
+    "/usr/bin/python",
+    "-m",
+    "pytest",
+    "-q",
+    "tests/test_compositor_frame_damage.py",
+    "tests/test_compositor.py::test_partial_redraw_requests_only_damaged_vertical_rows",
+    "tests/test_compositor.py::test_covered_widgets_skip_rendering_without_changing_output",
+    "tests/test_compositor.py::test_partly_covered_widgets_render_only_exposed_rows"
+  ],
+  "interpreter": "/usr/bin/python",
+  "seconds": 5.798375586979091,
+  "exit_code": 1,
+  "log": "/home/ts/wt/textual-native-subtree-strips-20261002/.artifacts/native-damage-span-admission-20261005/source-batch01.log",
+  "log_sha256": "978a85fdc13b0b68dfa6b3592e678703787453560f4122eb99dfdaec1481992a",
+  "scope": "ONE authorized source App batch for exact damage spans, Unicode/link metadata, frame resize/capture bounds, partial vertical rows and layered exposure. No installed prefix/build/SDK/provider/media or native67 controls.",
+  "installed_qualified": false,
+  "retained_log": "evidence/native-damage-span-admission-20261005/source-batch01.log"
+}
diff --git a/evidence/native-damage-span-admission-20261005/source-batch01.log b/evidence/native-damage-span-admission-20261005/source-batch01.log
new file mode 100644
index 0000000000..97fe9dd755
--- /dev/null
+++ b/evidence/native-damage-span-admission-20261005/source-batch01.log
@@ -0,0 +1,1000 @@
+......FF........                                                         [100%]
+=================================== FAILURES ===================================
+_ test_horizontal_damage_keeps_intervening_native_content_unpainted[regions0] __
+
+regions = ((2, 0, 3, 1), (22, 0, 3, 1))
+
+    @pytest.mark.parametrize('regions', [
+        ((2, 0, 3, 1), (22, 0, 3, 1)),
+        ((1, 0, 2, 1), (2, 0, 3, 1), (21, 2, 2, 1)),
+    ])
+    async def test_horizontal_damage_keeps_intervening_native_content_unpainted(regions):
+        """Damage islands must not materialize the unchanged pane between them."""
+        from rich.control import Control
+        from textual.geometry import Region
+    
+        class Counted(Static):
+            def __init__(self, **kwargs):
+                super().__init__("[link=https://example.com]A界BCDEFGH[/link]\nSECOND\nTHIRD", **kwargs)
+                self.crops = []
+    
+            def render_lines(self, crop):
+                self.crops.append(crop)
+                return super().render_lines(crop)
+    
+        class IslandsApp(App):
+            CSS = "Screen { layout: horizontal; } Counted { width: 10; height: 3; }"
+    
+            def compose(self):
+                for name in ('left', 'middle', 'right'):
+                    yield Counted(id=name)
+    
+        app = IslandsApp()
+>       async with app.run_test(size=(30, 5)) as pilot:
+                   ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+tests/test_compositor_frame_damage.py:136: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+/usr/lib/python3.14/contextlib.py:235: in __aexit__
+    await self.gen.athrow(value)
+src/textual/app.py:2228: in run_test
+    raise self._exception
+src/textual/message_pump.py:707: in _process_messages_loop
+    await self._dispatch_message(message)
+src/textual/message_pump.py:778: in _dispatch_message
+    await self.on_event(message)
+src/textual/message_pump.py:859: in on_event
+    await self._on_message(event)
+src/textual/message_pump.py:880: in _on_message
+    await invoke(method, message)
+src/textual/_callback.py:97: in invoke
+    return await _invoke(callback, *params)
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/_callback.py:57: in _invoke
+    result = callback(*params[:parameter_count])
+             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/screen.py:1563: in _on_screen_resume
+    self._refresh_layout(size)
+src/textual/screen.py:1437: in _refresh_layout
+    self._compositor_refresh()
+src/textual/screen.py:1243: in _compositor_refresh
+    update = self._compositor.render_update(
+src/textual/_compositor.py:1523: in render_update
+    return self.render_full_update(simplify=simplify)
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/_compositor.py:1559: in render_full_update
+    chops = self._render_chops(crop, self._regions_to_spans((screen_region,)),
+src/textual/_compositor.py:1713: in _render_chops
+    for render_region, strips in renders:
+                                 ^^^^^^^
+src/textual/_compositor.py:1493: in _get_renders
+    widget.render_lines(
+tests/test_compositor_frame_damage.py:126: in render_lines
+    return super().render_lines(crop)
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/widget.py:4511: in render_lines
+    strips = self._styles_cache.render_widget(self, crop)
+             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/_styles_cache.py:117: in render_widget
+    strips = self.render(
+src/textual/_styles_cache.py:222: in render
+    strip = render_line(
+src/textual/_styles_cache.py:457: in render_line
+    line = render_content_line(y - gutter.top)
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/widget.py:4489: in render_line
+    self._render_content()
+src/textual/widget.py:4471: in _render_content
+    visual = self._render()
+             ^^^^^^^^^^^^^^
+src/textual/widget.py:4698: in _render
+    visual = visualize(self, self.render(), markup=self._render_markup)
+                             ^^^^^^^^^^^^^
+src/textual/widgets/_static.py:85: in render
+    return self.visual
+           ^^^^^^^^^^^
+src/textual/widgets/_static.py:64: in visual
+    self.__visual = visualize(self, self.__content, markup=self._render_markup)
+                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/visual.py:103: in visualize
+    return Content.from_markup(obj) if markup else Content(obj)
+           ^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/content.py:299: in from_markup
+    content = to_content(markup, template_variables=variables or None)
+              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+markup = '[link=https://example.com]A界BCDEFGH[/link]\nSECOND\nTHIRD', style = ''
+template_variables = None
+
+    def to_content(
+        markup: str,
+        style: str | Style = "",
+        template_variables: Mapping[str, object] | None = None,
+    ) -> Content:
+        """Convert markup to Content.
+    
+        Args:
+            markup: String containing markup.
+            style: Optional base style.
+            template_variables: Mapping of string.Template variables
+    
+        Raises:
+            MarkupError: If the markup is invalid.
+    
+        Returns:
+            Content that renders the markup.
+        """
+        _rich_traceback_omit = True
+        try:
+            return _to_content(markup, style, template_variables)
+        except UnexpectedEnd:
+            raise MarkupError(
+                "Unexpected end of markup; are you missing a closing square bracket?"
+            ) from None
+        except Exception as error:
+            # Ensure all errors are wrapped in a MarkupError
+>           raise MarkupError(str(error)) from None
+E           textual.markup.MarkupError: Expected markup value (found '://example.com]A界BCDEFGH[/link]\n').
+
+src/textual/markup.py:320: MarkupError
+----------------------------- Captured stderr call -----------------------------
+╭───────────────────── Traceback (most recent call last) ──────────────────────╮
+│ /home/ts/wt/textual-native-subtree-strips-20261002/tests/test_compositor_fra │
+│ me_damage.py:126 in render_lines                                             │
+│                                                                              │
+│   123 │   │                                                                  │
+│   124 │   │   def render_lines(self, crop):                                  │
+│   125 │   │   │   self.crops.append(crop)                                    │
+│ ❱ 126 │   │   │   return super().render_lines(crop)                          │
+│   127 │                                                                      │
+│   128 │   class IslandsApp(App):                                             │
+│   129 │   │   CSS = "Screen { layout: horizontal; } Counted { width: 10; hei │
+│                                                                              │
+│ ╭────────────────── locals ───────────────────╮                              │
+│ │ crop = Region(x=0, y=0, width=10, height=3) │                              │
+│ │ self = Counted(id='right')                  │                              │
+│ ╰─────────────────────────────────────────────╯                              │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widget.py:451 │
+│ 1 in render_lines                                                            │
+│                                                                              │
+│   4508 │   │   │   │   Strip.blank(crop.width, self.visual_style.rich_style) │
+│   4509 │   │   │   ] * crop.height                                           │
+│   4510 │   │   else:                                                         │
+│ ❱ 4511 │   │   │   strips = self._styles_cache.render_widget(self, crop)     │
+│   4512 │   │   return strips                                                 │
+│   4513 │                                                                     │
+│   4514 │   def get_style_at(self, x: int, y: int) -> Style:                  │
+│                                                                              │
+│ ╭────────────────── locals ───────────────────╮                              │
+│ │ crop = Region(x=0, y=0, width=10, height=3) │                              │
+│ │ self = Counted(id='right')                  │                              │
+│ ╰─────────────────────────────────────────────╯                              │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/_styles_cache │
+│ .py:117 in render_widget                                                     │
+│                                                                              │
+│   114 │   │   base_background, background = widget.background_colors         │
+│   115 │   │   styles = widget.styles                                         │
+│   116 │   │   app = widget.app                                               │
+│ ❱ 117 │   │   strips = self.render(                                          │
+│   118 │   │   │   styles,                                                    │
+│   119 │   │   │   widget.region.size,                                        │
+│   120 │   │   │   base_background,                                           │
+│                                                                              │
+│ ╭───────────────────────────────── locals ─────────────────────────────────╮ │
+│ │             app = IslandsApp(                                            │ │
+│ │                   │   title='IslandsApp',                                │ │
+│ │                   │   classes={'-dark-mode'},                            │ │
+│ │                   │   pseudo_classes={'focus', 'nocolor', 'dark'}        │ │
+│ │                   )                                                      │ │
+│ │      background = Color(18, 18, 18)                                      │ │
+│ │ base_background = Color(18, 18, 18)                                      │ │
+│ │ border_subtitle = None                                                   │ │
+│ │    border_title = None                                                   │ │
+│ │            crop = Region(x=0, y=0, width=10, height=3)                   │ │
+│ │            self = <StylesCache size=Size(width=10, height=3)>            │ │
+│ │          styles = RenderStyles(                                          │ │
+│ │                   │   Counted(id='right'),                               │ │
+│ │                   │   background=Color(0, 0, 0, a=0),                    │ │
+│ │                   │   width=Scalar(                                      │ │
+│ │                   │   │   value=10.0,                                    │ │
+│ │                   │   │   unit=<Unit.CELLS: 1>,                          │ │
+│ │                   │   │   percent_unit=<Unit.WIDTH: 4>                   │ │
+│ │                   │   ),                                                 │ │
+│ │                   │   height=Scalar(                                     │ │
+│ │                   │   │   value=3.0,                                     │ │
+│ │                   │   │   unit=<Unit.CELLS: 1>,                          │ │
+│ │                   │   │   percent_unit=<Unit.WIDTH: 4>                   │ │
+│ │                   │   ),                                                 │ │
+│ │                   │   scrollbar_color=Color(0, 48, 84),                  │ │
+│ │                   │   scrollbar_color_hover=Color(0, 60, 106),           │ │
+│ │                   │   scrollbar_color_active=Color(1, 120, 212),         │ │
+│ │                   │   scrollbar_corner_color=Color(0, 0, 0),             │ │
+│ │                   │   scrollbar_background=Color(0, 0, 0),               │ │
+│ │                   │   scrollbar_background_hover=Color(0, 0, 0),         │ │
+│ │                   │   scrollbar_background_active=Color(0, 0, 0),        │ │
+│ │                   │   scrollbar_size_vertical=2,                         │ │
+│ │                   │   scrollbar_size_horizontal=1,                       │ │
+│ │                   │   link_color=Color(255, 255, 255, a=0.87),           │ │
+│ │                   │   auto_link_color=True,                              │ │
+│ │                   │   link_background=Color(0, 0, 0, a=0),               │ │
+│ │                   │   link_style=Style(underline=True),                  │ │
+│ │                   │   link_color_hover=Color(255, 255, 255, a=0.87),     │ │
+│ │                   │   auto_link_color_hover=True,                        │ │
+│ │                   │   link_background_hover=Color(1, 120, 212),          │ │
+│ │                   │   link_style_hover=Style(                            │ │
+│ │                   │   │   bold=True,                                     │ │
+│ │                   │   │   underline=False                                │ │
+│ │                   │   )                                                  │ │
+│ │                   )                                                      │ │
+│ │          widget = Counted(id='right')                                    │ │
+│ ╰──────────────────────────────────────────────────────────────────────────╯ │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/_styles_cache │
+│ .py:222 in render                                                            │
+│                                                                              │
+│   219 │   │                                                                  │
+│   220 │   │   for y in crop.line_range:                                      │
+│   221 │   │   │   if is_dirty(y) or y not in self._cache:                    │
+│ ❱ 222 │   │   │   │   strip = render_line(                                   │
+│   223 │   │   │   │   │   styles,                                            │
+│   224 │   │   │   │   │   y,                                                 │
+│   225 │   │   │   │   │   size,                                              │
+│                                                                              │
+│ ╭───────────────────────────────── locals ─────────────────────────────────╮ │
+│ │             _height = 3                                                  │ │
+│ │           add_strip = <built-in method append of list object at          │ │
+│ │                       0x7f21f0c71900>                                    │ │
+│ │          ansi_theme = <rich.terminal_theme.TerminalTheme object at       │ │
+│ │                       0x7f21f04072f0>                                    │ │
+│ │          background = Color(18, 18, 18)                                  │ │
+│ │     base_background = Color(18, 18, 18)                                  │ │
+│ │     border_subtitle = None                                               │ │
+│ │        border_title = None                                               │ │
+│ │        content_size = Size(width=10, height=3)                           │ │
+│ │                crop = Region(x=0, y=0, width=10, height=3)               │ │
+│ │             filters = [                                                  │ │
+│ │                       │   <textual.filter.ANSIToTruecolor object at      │ │
+│ │                       0x7f21f0fb03b0>,                                   │ │
+│ │                       │   <textual.filter.Monochrome object at           │ │
+│ │                       0x7f21f0fb20f0>                                    │ │
+│ │                       ]                                                  │ │
+│ │            is_dirty = <built-in method __contains__ of set object at     │ │
+│ │                       0x7f21f0b7f220>                                    │ │
+│ │         native_ansi = False                                              │ │
+│ │             opacity = 1.0                                                │ │
+│ │             padding = Spacing(top=0, right=0, bottom=0, left=0)          │ │
+│ │ render_content_line = <bound method Widget.render_line of                │ │
+│ │                       Counted(id='right')>                               │ │
+│ │         render_line = <bound method StylesCache.render_line of           │ │
+│ │                       <StylesCache size=Size(width=10, height=3)>>       │ │
+│ │                self = <StylesCache size=Size(width=10, height=3)>        │ │
+│ │                size = Size(width=10, height=3)                           │ │
+│ │              strips = []                                                 │ │
+│ │              styles = RenderStyles(                                      │ │
+│ │                       │   Counted(id='right'),                           │ │
+│ │                       │   background=Color(0, 0, 0, a=0),                │ │
+│ │                       │   width=Scalar(                                  │ │
+│ │                       │   │   value=10.0,                                │ │
+│ │                       │   │   unit=<Unit.CELLS: 1>,                      │ │
+│ │                       │   │   percent_unit=<Unit.WIDTH: 4>               │ │
+│ │                       │   ),                                             │ │
+│ │                       │   height=Scalar(                                 │ │
+│ │                       │   │   value=3.0,                                 │ │
+│ │                       │   │   unit=<Unit.CELLS: 1>,                      │ │
+│ │                       │   │   percent_unit=<Unit.WIDTH: 4>               │ │
+│ │                       │   ),                                             │ │
+│ │                       │   scrollbar_color=Color(0, 48, 84),              │ │
+│ │                       │   scrollbar_color_hover=Color(0, 60, 106),       │ │
+│ │                       │   scrollbar_color_active=Color(1, 120, 212),     │ │
+│ │                       │   scrollbar_corner_color=Color(0, 0, 0),         │ │
+│ │                       │   scrollbar_background=Color(0, 0, 0),           │ │
+│ │                       │   scrollbar_background_hover=Color(0, 0, 0),     │ │
+│ │                       │   scrollbar_background_active=Color(0, 0, 0),    │ │
+│ │                       │   scrollbar_size_vertical=2,                     │ │
+│ │                       │   scrollbar_size_horizontal=1,                   │ │
+│ │                       │   link_color=Color(255, 255, 255, a=0.87),       │ │
+│ │                       │   auto_link_color=True,                          │ │
+│ │                       │   link_background=Color(0, 0, 0, a=0),           │ │
+│ │                       │   link_style=Style(underline=True),              │ │
+│ │                       │   link_color_hover=Color(                        │ │
+│ │                       │   │   255,                                       │ │
+│ │                       │   │   255,                                       │ │
+│ │                       │   │   255,                                       │ │
+│ │                       │   │   a=0.87                                     │ │
+│ │                       │   ),                                             │ │
+│ │                       │   auto_link_color_hover=True,                    │ │
+│ │                       │   link_background_hover=Color(1, 120, 212),      │ │
+│ │                       │   link_style_hover=Style(                        │ │
+│ │                       │   │   bold=True,                                 │ │
+│ │                       │   │   underline=False                            │ │
+│ │                       │   )                                              │ │
+│ │                       )                                                  │ │
+│ │               width = 10                                                 │ │
+│ │                   y = 0                                                  │ │
+│ ╰──────────────────────────────────────────────────────────────────────────╯ │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/_styles_cache │
+│ .py:457 in render_line                                                       │
+│                                                                              │
+│   454 │   │   │   # Content with border and padding (C)                      │
+│   455 │   │   │   content_y = y - gutter.top                                 │
+│   456 │   │   │   if content_y < content_height:                             │
+│ ❱ 457 │   │   │   │   line = render_content_line(y - gutter.top)             │
+│   458 │   │   │   │   line = line.adjust_cell_length(content_width, inner.ri │
+│   459 │   │   │   else:                                                      │
+│   460 │   │   │   │   line = Strip.blank(content_width, inner.rich_style)    │
+│                                                                              │
+│ ╭───────────────────────────────── locals ─────────────────────────────────╮ │
+│ │           ansi_theme = <rich.terminal_theme.TerminalTheme object at      │ │
+│ │                        0x7f21f04072f0>                                   │ │
+│ │           background = Color(18, 18, 18)                                 │ │
+│ │      base_background = Color(18, 18, 18)                                 │ │
+│ │        border_bottom = ''                                                │ │
+│ │  border_bottom_color = Color(0, 255, 0)                                  │ │
+│ │          border_left = ''                                                │ │
+│ │    border_left_color = Color(0, 255, 0)                                  │ │
+│ │         border_right = ''                                                │ │
+│ │   border_right_color = Color(0, 255, 0)                                  │ │
+│ │      border_subtitle = None                                              │ │
+│ │         border_title = None                                              │ │
+│ │           border_top = ''                                                │ │
+│ │     border_top_color = Color(0, 255, 0)                                  │ │
+│ │   cache_simple_strip = False                                             │ │
+│ │       content_height = 3                                                 │ │
+│ │         content_size = Size(width=10, height=3)                          │ │
+│ │        content_width = 10                                                │ │
+│ │            content_y = 0                                                 │ │
+│ │           from_color = <bound method Style.from_color of <class          │ │
+│ │                        'rich.style.Style'>>                              │ │
+│ │               gutter = Spacing(top=0, right=0, bottom=0, left=0)         │ │
+│ │               height = 3                                                 │ │
+│ │                inner = Style(background=Color(18, 18, 18))               │ │
+│ │          native_ansi = False                                             │ │
+│ │              opacity = 1.0                                               │ │
+│ │                outer = Style(background=Color(18, 18, 18))               │ │
+│ │       outline_bottom = ''                                                │ │
+│ │ outline_bottom_color = Color(0, 255, 0)                                  │ │
+│ │         outline_left = ''                                                │ │
+│ │   outline_left_color = Color(0, 255, 0)                                  │ │
+│ │        outline_right = ''                                                │ │
+│ │  outline_right_color = Color(0, 255, 0)                                  │ │
+│ │          outline_top = ''                                                │ │
+│ │    outline_top_color = Color(0, 255, 0)                                  │ │
+│ │           pad_bottom = 0                                                 │ │
+│ │             pad_left = 0                                                 │ │
+│ │            pad_right = 0                                                 │ │
+│ │              pad_top = 0                                                 │ │
+│ │              padding = Spacing(top=0, right=0, bottom=0, left=0)         │ │
+│ │  render_content_line = <bound method Widget.render_line of               │ │
+│ │                        Counted(id='right')>                              │ │
+│ │                 self = <StylesCache size=Size(width=10, height=3)>       │ │
+│ │                 size = Size(width=10, height=3)                          │ │
+│ │               styles = RenderStyles(                                     │ │
+│ │                        │   Counted(id='right'),                          │ │
+│ │                        │   background=Color(0, 0, 0, a=0),               │ │
+│ │                        │   width=Scalar(                                 │ │
+│ │                        │   │   value=10.0,                               │ │
+│ │                        │   │   unit=<Unit.CELLS: 1>,                     │ │
+│ │                        │   │   percent_unit=<Unit.WIDTH: 4>              │ │
+│ │                        │   ),                                            │ │
+│ │                        │   height=Scalar(                                │ │
+│ │                        │   │   value=3.0,                                │ │
+│ │                        │   │   unit=<Unit.CELLS: 1>,                     │ │
+│ │                        │   │   percent_unit=<Unit.WIDTH: 4>              │ │
+│ │                        │   ),                                            │ │
+│ │                        │   scrollbar_color=Color(0, 48, 84),             │ │
+│ │                        │   scrollbar_color_hover=Color(0, 60, 106),      │ │
+│ │                        │   scrollbar_color_active=Color(1, 120, 212),    │ │
+│ │                        │   scrollbar_corner_color=Color(0, 0, 0),        │ │
+│ │                        │   scrollbar_background=Color(0, 0, 0),          │ │
+│ │                        │   scrollbar_background_hover=Color(0, 0, 0),    │ │
+│ │                        │   scrollbar_background_active=Color(0, 0, 0),   │ │
+│ │                        │   scrollbar_size_vertical=2,                    │ │
+│ │                        │   scrollbar_size_horizontal=1,                  │ │
+│ │                        │   link_color=Color(255, 255, 255, a=0.87),      │ │
+│ │                        │   auto_link_color=True,                         │ │
+│ │                        │   link_background=Color(0, 0, 0, a=0),          │ │
+│ │                        │   link_style=Style(underline=True),             │ │
+│ │                        │   link_color_hover=Color(                       │ │
+│ │                        │   │   255,                                      │ │
+│ │                        │   │   255,                                      │ │
+│ │                        │   │   255,                                      │ │
+│ │                        │   │   a=0.87                                    │ │
+│ │                        │   ),                                            │ │
+│ │                        │   auto_link_color_hover=True,                   │ │
+│ │                        │   link_background_hover=Color(1, 120, 212),     │ │
+│ │                        │   link_style_hover=Style(                       │ │
+│ │                        │   │   bold=True,                                │ │
+│ │                        │   │   underline=False                           │ │
+│ │                        │   )                                             │ │
+│ │                        )                                                 │ │
+│ │                width = 10                                                │ │
+│ │                    y = 0                                                 │ │
+│ ╰──────────────────────────────────────────────────────────────────────────╯ │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widget.py:448 │
+│ 9 in render_line                                                             │
+│                                                                              │
+│   4486 │   │   │   return Strip.blank(self.size.width, self.visual_style.ric │
+│   4487 │   │                                                                 │
+│   4488 │   │   if self._dirty_regions or self._render_cache.size != self.siz │
+│ ❱ 4489 │   │   │   self._render_content()                                    │
+│   4490 │   │   try:                                                          │
+│   4491 │   │   │   line = self._render_cache.lines[y]                        │
+│   4492 │   │   except IndexError:                                            │
+│                                                                              │
+│ ╭────────── locals ──────────╮                                               │
+│ │ self = Counted(id='right') │                                               │
+│ │    y = 0                   │                                               │
+│ ╰────────────────────────────╯                                               │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widget.py:447 │
+│ 1 in _render_content                                                         │
+│                                                                              │
+│   4468 │   │   """Render all lines."""                                       │
+│   4469 │   │   size = self.size                                              │
+│   4470 │   │   width, height = size                                          │
+│ ❱ 4471 │   │   visual = self._render()                                       │
+│   4472 │   │   strips = Visual.to_strips(self, visual, width, height, self.v │
+│   4473 │   │   self._render_cache = _RenderCache(size, strips)               │
+│   4474 │   │   self._dirty_regions.clear()                                   │
+│                                                                              │
+│ ╭───────────── locals ──────────────╮                                        │
+│ │ height = 3                        │                                        │
+│ │   self = Counted(id='right')      │                                        │
+│ │   size = Size(width=10, height=3) │                                        │
+│ │  width = 10                       │                                        │
+│ ╰───────────────────────────────────╯                                        │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widget.py:469 │
+│ 8 in _render                                                                 │
+│                                                                              │
+│   4695 │   │   if cached_visual is not None:                                 │
+│   4696 │   │   │   assert isinstance(cached_visual, Visual)                  │
+│   4697 │   │   │   return cached_visual                                      │
+│ ❱ 4698 │   │   visual = visualize(self, self.render(), markup=self._render_m │
+│   4699 │   │   self._layout_cache[cache_key] = visual                        │
+│   4700 │   │   return visual                                                 │
+│   4701                                                                       │
+│                                                                              │
+│ ╭────────────── locals ───────────────╮                                      │
+│ │     cache_key = '_render.visual'    │                                      │
+│ │ cached_visual = None                │                                      │
+│ │          self = Counted(id='right') │                                      │
+│ ╰─────────────────────────────────────╯                                      │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widgets/_stat │
+│ ic.py:85 in render                                                           │
+│                                                                              │
+│    82 │   │   Returns:                                                       │
+│    83 │   │   │   A rich renderable.                                         │
+│    84 │   │   """                                                            │
+│ ❱  85 │   │   return self.visual                                             │
+│    86 │                                                                      │
+│    87 │   def _render_styles_sensitive(self) -> bool:                        │
+│    88 │   │   """Only original Content has the native rule-measurement contr │
+│                                                                              │
+│ ╭────────── locals ──────────╮                                               │
+│ │ self = Counted(id='right') │                                               │
+│ ╰────────────────────────────╯                                               │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widgets/_stat │
+│ ic.py:64 in visual                                                           │
+│                                                                              │
+│    61 │   │                                                                  │
+│    62 │   │   """                                                            │
+│    63 │   │   if self.__visual is None:                                      │
+│ ❱  64 │   │   │   self.__visual = visualize(self, self.__content, markup=sel │
+│    65 │   │   return self.__visual                                           │
+│    66 │                                                                      │
+│    67 │   @property                                                          │
+│                                                                              │
+│ ╭────────── locals ──────────╮                                               │
+│ │ self = Counted(id='right') │                                               │
+│ ╰────────────────────────────╯                                               │
+╰──────────────────────────────────────────────────────────────────────────────╯
+MarkupError: Expected markup value (found '://example.com]A界BCDEFGH[/link]\n').
+_ test_horizontal_damage_keeps_intervening_native_content_unpainted[regions1] __
+
+regions = ((1, 0, 2, 1), (2, 0, 3, 1), (21, 2, 2, 1))
+
+    @pytest.mark.parametrize('regions', [
+        ((2, 0, 3, 1), (22, 0, 3, 1)),
+        ((1, 0, 2, 1), (2, 0, 3, 1), (21, 2, 2, 1)),
+    ])
+    async def test_horizontal_damage_keeps_intervening_native_content_unpainted(regions):
+        """Damage islands must not materialize the unchanged pane between them."""
+        from rich.control import Control
+        from textual.geometry import Region
+    
+        class Counted(Static):
+            def __init__(self, **kwargs):
+                super().__init__("[link=https://example.com]A界BCDEFGH[/link]\nSECOND\nTHIRD", **kwargs)
+                self.crops = []
+    
+            def render_lines(self, crop):
+                self.crops.append(crop)
+                return super().render_lines(crop)
+    
+        class IslandsApp(App):
+            CSS = "Screen { layout: horizontal; } Counted { width: 10; height: 3; }"
+    
+            def compose(self):
+                for name in ('left', 'middle', 'right'):
+                    yield Counted(id=name)
+    
+        app = IslandsApp()
+>       async with app.run_test(size=(30, 5)) as pilot:
+                   ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+tests/test_compositor_frame_damage.py:136: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+/usr/lib/python3.14/contextlib.py:235: in __aexit__
+    await self.gen.athrow(value)
+src/textual/app.py:2228: in run_test
+    raise self._exception
+src/textual/message_pump.py:707: in _process_messages_loop
+    await self._dispatch_message(message)
+src/textual/message_pump.py:778: in _dispatch_message
+    await self.on_event(message)
+src/textual/message_pump.py:859: in on_event
+    await self._on_message(event)
+src/textual/message_pump.py:880: in _on_message
+    await invoke(method, message)
+src/textual/_callback.py:97: in invoke
+    return await _invoke(callback, *params)
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/_callback.py:57: in _invoke
+    result = callback(*params[:parameter_count])
+             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/screen.py:1563: in _on_screen_resume
+    self._refresh_layout(size)
+src/textual/screen.py:1437: in _refresh_layout
+    self._compositor_refresh()
+src/textual/screen.py:1243: in _compositor_refresh
+    update = self._compositor.render_update(
+src/textual/_compositor.py:1523: in render_update
+    return self.render_full_update(simplify=simplify)
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/_compositor.py:1559: in render_full_update
+    chops = self._render_chops(crop, self._regions_to_spans((screen_region,)),
+src/textual/_compositor.py:1713: in _render_chops
+    for render_region, strips in renders:
+                                 ^^^^^^^
+src/textual/_compositor.py:1493: in _get_renders
+    widget.render_lines(
+tests/test_compositor_frame_damage.py:126: in render_lines
+    return super().render_lines(crop)
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/widget.py:4511: in render_lines
+    strips = self._styles_cache.render_widget(self, crop)
+             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/_styles_cache.py:117: in render_widget
+    strips = self.render(
+src/textual/_styles_cache.py:222: in render
+    strip = render_line(
+src/textual/_styles_cache.py:457: in render_line
+    line = render_content_line(y - gutter.top)
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/widget.py:4489: in render_line
+    self._render_content()
+src/textual/widget.py:4471: in _render_content
+    visual = self._render()
+             ^^^^^^^^^^^^^^
+src/textual/widget.py:4698: in _render
+    visual = visualize(self, self.render(), markup=self._render_markup)
+                             ^^^^^^^^^^^^^
+src/textual/widgets/_static.py:85: in render
+    return self.visual
+           ^^^^^^^^^^^
+src/textual/widgets/_static.py:64: in visual
+    self.__visual = visualize(self, self.__content, markup=self._render_markup)
+                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/visual.py:103: in visualize
+    return Content.from_markup(obj) if markup else Content(obj)
+           ^^^^^^^^^^^^^^^^^^^^^^^^
+src/textual/content.py:299: in from_markup
+    content = to_content(markup, template_variables=variables or None)
+              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+markup = '[link=https://example.com]A界BCDEFGH[/link]\nSECOND\nTHIRD', style = ''
+template_variables = None
+
+    def to_content(
+        markup: str,
+        style: str | Style = "",
+        template_variables: Mapping[str, object] | None = None,
+    ) -> Content:
+        """Convert markup to Content.
+    
+        Args:
+            markup: String containing markup.
+            style: Optional base style.
+            template_variables: Mapping of string.Template variables
+    
+        Raises:
+            MarkupError: If the markup is invalid.
+    
+        Returns:
+            Content that renders the markup.
+        """
+        _rich_traceback_omit = True
+        try:
+            return _to_content(markup, style, template_variables)
+        except UnexpectedEnd:
+            raise MarkupError(
+                "Unexpected end of markup; are you missing a closing square bracket?"
+            ) from None
+        except Exception as error:
+            # Ensure all errors are wrapped in a MarkupError
+>           raise MarkupError(str(error)) from None
+E           textual.markup.MarkupError: Expected markup value (found '://example.com]A界BCDEFGH[/link]\n').
+
+src/textual/markup.py:320: MarkupError
+----------------------------- Captured stderr call -----------------------------
+╭───────────────────── Traceback (most recent call last) ──────────────────────╮
+│ /home/ts/wt/textual-native-subtree-strips-20261002/tests/test_compositor_fra │
+│ me_damage.py:126 in render_lines                                             │
+│                                                                              │
+│   123 │   │                                                                  │
+│   124 │   │   def render_lines(self, crop):                                  │
+│   125 │   │   │   self.crops.append(crop)                                    │
+│ ❱ 126 │   │   │   return super().render_lines(crop)                          │
+│   127 │                                                                      │
+│   128 │   class IslandsApp(App):                                             │
+│   129 │   │   CSS = "Screen { layout: horizontal; } Counted { width: 10; hei │
+│                                                                              │
+│ ╭────────────────── locals ───────────────────╮                              │
+│ │ crop = Region(x=0, y=0, width=10, height=3) │                              │
+│ │ self = Counted(id='right')                  │                              │
+│ ╰─────────────────────────────────────────────╯                              │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widget.py:451 │
+│ 1 in render_lines                                                            │
+│                                                                              │
+│   4508 │   │   │   │   Strip.blank(crop.width, self.visual_style.rich_style) │
+│   4509 │   │   │   ] * crop.height                                           │
+│   4510 │   │   else:                                                         │
+│ ❱ 4511 │   │   │   strips = self._styles_cache.render_widget(self, crop)     │
+│   4512 │   │   return strips                                                 │
+│   4513 │                                                                     │
+│   4514 │   def get_style_at(self, x: int, y: int) -> Style:                  │
+│                                                                              │
+│ ╭────────────────── locals ───────────────────╮                              │
+│ │ crop = Region(x=0, y=0, width=10, height=3) │                              │
+│ │ self = Counted(id='right')                  │                              │
+│ ╰─────────────────────────────────────────────╯                              │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/_styles_cache │
+│ .py:117 in render_widget                                                     │
+│                                                                              │
+│   114 │   │   base_background, background = widget.background_colors         │
+│   115 │   │   styles = widget.styles                                         │
+│   116 │   │   app = widget.app                                               │
+│ ❱ 117 │   │   strips = self.render(                                          │
+│   118 │   │   │   styles,                                                    │
+│   119 │   │   │   widget.region.size,                                        │
+│   120 │   │   │   base_background,                                           │
+│                                                                              │
+│ ╭───────────────────────────────── locals ─────────────────────────────────╮ │
+│ │             app = IslandsApp(                                            │ │
+│ │                   │   title='IslandsApp',                                │ │
+│ │                   │   classes={'-dark-mode'},                            │ │
+│ │                   │   pseudo_classes={'focus', 'nocolor', 'dark'}        │ │
+│ │                   )                                                      │ │
+│ │      background = Color(18, 18, 18)                                      │ │
+│ │ base_background = Color(18, 18, 18)                                      │ │
+│ │ border_subtitle = None                                                   │ │
+│ │    border_title = None                                                   │ │
+│ │            crop = Region(x=0, y=0, width=10, height=3)                   │ │
+│ │            self = <StylesCache size=Size(width=10, height=3)>            │ │
+│ │          styles = RenderStyles(                                          │ │
+│ │                   │   Counted(id='right'),                               │ │
+│ │                   │   background=Color(0, 0, 0, a=0),                    │ │
+│ │                   │   width=Scalar(                                      │ │
+│ │                   │   │   value=10.0,                                    │ │
+│ │                   │   │   unit=<Unit.CELLS: 1>,                          │ │
+│ │                   │   │   percent_unit=<Unit.WIDTH: 4>                   │ │
+│ │                   │   ),                                                 │ │
+│ │                   │   height=Scalar(                                     │ │
+│ │                   │   │   value=3.0,                                     │ │
+│ │                   │   │   unit=<Unit.CELLS: 1>,                          │ │
+│ │                   │   │   percent_unit=<Unit.WIDTH: 4>                   │ │
+│ │                   │   ),                                                 │ │
+│ │                   │   scrollbar_color=Color(0, 48, 84),                  │ │
+│ │                   │   scrollbar_color_hover=Color(0, 60, 106),           │ │
+│ │                   │   scrollbar_color_active=Color(1, 120, 212),         │ │
+│ │                   │   scrollbar_corner_color=Color(0, 0, 0),             │ │
+│ │                   │   scrollbar_background=Color(0, 0, 0),               │ │
+│ │                   │   scrollbar_background_hover=Color(0, 0, 0),         │ │
+│ │                   │   scrollbar_background_active=Color(0, 0, 0),        │ │
+│ │                   │   scrollbar_size_vertical=2,                         │ │
+│ │                   │   scrollbar_size_horizontal=1,                       │ │
+│ │                   │   link_color=Color(255, 255, 255, a=0.87),           │ │
+│ │                   │   auto_link_color=True,                              │ │
+│ │                   │   link_background=Color(0, 0, 0, a=0),               │ │
+│ │                   │   link_style=Style(underline=True),                  │ │
+│ │                   │   link_color_hover=Color(255, 255, 255, a=0.87),     │ │
+│ │                   │   auto_link_color_hover=True,                        │ │
+│ │                   │   link_background_hover=Color(1, 120, 212),          │ │
+│ │                   │   link_style_hover=Style(                            │ │
+│ │                   │   │   bold=True,                                     │ │
+│ │                   │   │   underline=False                                │ │
+│ │                   │   )                                                  │ │
+│ │                   )                                                      │ │
+│ │          widget = Counted(id='right')                                    │ │
+│ ╰──────────────────────────────────────────────────────────────────────────╯ │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/_styles_cache │
+│ .py:222 in render                                                            │
+│                                                                              │
+│   219 │   │                                                                  │
+│   220 │   │   for y in crop.line_range:                                      │
+│   221 │   │   │   if is_dirty(y) or y not in self._cache:                    │
+│ ❱ 222 │   │   │   │   strip = render_line(                                   │
+│   223 │   │   │   │   │   styles,                                            │
+│   224 │   │   │   │   │   y,                                                 │
+│   225 │   │   │   │   │   size,                                              │
+│                                                                              │
+│ ╭───────────────────────────────── locals ─────────────────────────────────╮ │
+│ │             _height = 3                                                  │ │
+│ │           add_strip = <built-in method append of list object at          │ │
+│ │                       0x7f21eef54ec0>                                    │ │
+│ │          ansi_theme = <rich.terminal_theme.TerminalTheme object at       │ │
+│ │                       0x7f21f04072f0>                                    │ │
+│ │          background = Color(18, 18, 18)                                  │ │
+│ │     base_background = Color(18, 18, 18)                                  │ │
+│ │     border_subtitle = None                                               │ │
+│ │        border_title = None                                               │ │
+│ │        content_size = Size(width=10, height=3)                           │ │
+│ │                crop = Region(x=0, y=0, width=10, height=3)               │ │
+│ │             filters = [                                                  │ │
+│ │                       │   <textual.filter.ANSIToTruecolor object at      │ │
+│ │                       0x7f21f0b0bf00>,                                   │ │
+│ │                       │   <textual.filter.Monochrome object at           │ │
+│ │                       0x7f21f0c9de10>                                    │ │
+│ │                       ]                                                  │ │
+│ │            is_dirty = <built-in method __contains__ of set object at     │ │
+│ │                       0x7f21f0bbf5a0>                                    │ │
+│ │         native_ansi = False                                              │ │
+│ │             opacity = 1.0                                                │ │
+│ │             padding = Spacing(top=0, right=0, bottom=0, left=0)          │ │
+│ │ render_content_line = <bound method Widget.render_line of                │ │
+│ │                       Counted(id='right')>                               │ │
+│ │         render_line = <bound method StylesCache.render_line of           │ │
+│ │                       <StylesCache size=Size(width=10, height=3)>>       │ │
+│ │                self = <StylesCache size=Size(width=10, height=3)>        │ │
+│ │                size = Size(width=10, height=3)                           │ │
+│ │              strips = []                                                 │ │
+│ │              styles = RenderStyles(                                      │ │
+│ │                       │   Counted(id='right'),                           │ │
+│ │                       │   background=Color(0, 0, 0, a=0),                │ │
+│ │                       │   width=Scalar(                                  │ │
+│ │                       │   │   value=10.0,                                │ │
+│ │                       │   │   unit=<Unit.CELLS: 1>,                      │ │
+│ │                       │   │   percent_unit=<Unit.WIDTH: 4>               │ │
+│ │                       │   ),                                             │ │
+│ │                       │   height=Scalar(                                 │ │
+│ │                       │   │   value=3.0,                                 │ │
+│ │                       │   │   unit=<Unit.CELLS: 1>,                      │ │
+│ │                       │   │   percent_unit=<Unit.WIDTH: 4>               │ │
+│ │                       │   ),                                             │ │
+│ │                       │   scrollbar_color=Color(0, 48, 84),              │ │
+│ │                       │   scrollbar_color_hover=Color(0, 60, 106),       │ │
+│ │                       │   scrollbar_color_active=Color(1, 120, 212),     │ │
+│ │                       │   scrollbar_corner_color=Color(0, 0, 0),         │ │
+│ │                       │   scrollbar_background=Color(0, 0, 0),           │ │
+│ │                       │   scrollbar_background_hover=Color(0, 0, 0),     │ │
+│ │                       │   scrollbar_background_active=Color(0, 0, 0),    │ │
+│ │                       │   scrollbar_size_vertical=2,                     │ │
+│ │                       │   scrollbar_size_horizontal=1,                   │ │
+│ │                       │   link_color=Color(255, 255, 255, a=0.87),       │ │
+│ │                       │   auto_link_color=True,                          │ │
+│ │                       │   link_background=Color(0, 0, 0, a=0),           │ │
+│ │                       │   link_style=Style(underline=True),              │ │
+│ │                       │   link_color_hover=Color(                        │ │
+│ │                       │   │   255,                                       │ │
+│ │                       │   │   255,                                       │ │
+│ │                       │   │   255,                                       │ │
+│ │                       │   │   a=0.87                                     │ │
+│ │                       │   ),                                             │ │
+│ │                       │   auto_link_color_hover=True,                    │ │
+│ │                       │   link_background_hover=Color(1, 120, 212),      │ │
+│ │                       │   link_style_hover=Style(                        │ │
+│ │                       │   │   bold=True,                                 │ │
+│ │                       │   │   underline=False                            │ │
+│ │                       │   )                                              │ │
+│ │                       )                                                  │ │
+│ │               width = 10                                                 │ │
+│ │                   y = 0                                                  │ │
+│ ╰──────────────────────────────────────────────────────────────────────────╯ │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/_styles_cache │
+│ .py:457 in render_line                                                       │
+│                                                                              │
+│   454 │   │   │   # Content with border and padding (C)                      │
+│   455 │   │   │   content_y = y - gutter.top                                 │
+│   456 │   │   │   if content_y < content_height:                             │
+│ ❱ 457 │   │   │   │   line = render_content_line(y - gutter.top)             │
+│   458 │   │   │   │   line = line.adjust_cell_length(content_width, inner.ri │
+│   459 │   │   │   else:                                                      │
+│   460 │   │   │   │   line = Strip.blank(content_width, inner.rich_style)    │
+│                                                                              │
+│ ╭───────────────────────────────── locals ─────────────────────────────────╮ │
+│ │           ansi_theme = <rich.terminal_theme.TerminalTheme object at      │ │
+│ │                        0x7f21f04072f0>                                   │ │
+│ │           background = Color(18, 18, 18)                                 │ │
+│ │      base_background = Color(18, 18, 18)                                 │ │
+│ │        border_bottom = ''                                                │ │
+│ │  border_bottom_color = Color(0, 255, 0)                                  │ │
+│ │          border_left = ''                                                │ │
+│ │    border_left_color = Color(0, 255, 0)                                  │ │
+│ │         border_right = ''                                                │ │
+│ │   border_right_color = Color(0, 255, 0)                                  │ │
+│ │      border_subtitle = None                                              │ │
+│ │         border_title = None                                              │ │
+│ │           border_top = ''                                                │ │
+│ │     border_top_color = Color(0, 255, 0)                                  │ │
+│ │   cache_simple_strip = False                                             │ │
+│ │       content_height = 3                                                 │ │
+│ │         content_size = Size(width=10, height=3)                          │ │
+│ │        content_width = 10                                                │ │
+│ │            content_y = 0                                                 │ │
+│ │           from_color = <bound method Style.from_color of <class          │ │
+│ │                        'rich.style.Style'>>                              │ │
+│ │               gutter = Spacing(top=0, right=0, bottom=0, left=0)         │ │
+│ │               height = 3                                                 │ │
+│ │                inner = Style(background=Color(18, 18, 18))               │ │
+│ │          native_ansi = False                                             │ │
+│ │              opacity = 1.0                                               │ │
+│ │                outer = Style(background=Color(18, 18, 18))               │ │
+│ │       outline_bottom = ''                                                │ │
+│ │ outline_bottom_color = Color(0, 255, 0)                                  │ │
+│ │         outline_left = ''                                                │ │
+│ │   outline_left_color = Color(0, 255, 0)                                  │ │
+│ │        outline_right = ''                                                │ │
+│ │  outline_right_color = Color(0, 255, 0)                                  │ │
+│ │          outline_top = ''                                                │ │
+│ │    outline_top_color = Color(0, 255, 0)                                  │ │
+│ │           pad_bottom = 0                                                 │ │
+│ │             pad_left = 0                                                 │ │
+│ │            pad_right = 0                                                 │ │
+│ │              pad_top = 0                                                 │ │
+│ │              padding = Spacing(top=0, right=0, bottom=0, left=0)         │ │
+│ │  render_content_line = <bound method Widget.render_line of               │ │
+│ │                        Counted(id='right')>                              │ │
+│ │                 self = <StylesCache size=Size(width=10, height=3)>       │ │
+│ │                 size = Size(width=10, height=3)                          │ │
+│ │               styles = RenderStyles(                                     │ │
+│ │                        │   Counted(id='right'),                          │ │
+│ │                        │   background=Color(0, 0, 0, a=0),               │ │
+│ │                        │   width=Scalar(                                 │ │
+│ │                        │   │   value=10.0,                               │ │
+│ │                        │   │   unit=<Unit.CELLS: 1>,                     │ │
+│ │                        │   │   percent_unit=<Unit.WIDTH: 4>              │ │
+│ │                        │   ),                                            │ │
+│ │                        │   height=Scalar(                                │ │
+│ │                        │   │   value=3.0,                                │ │
+│ │                        │   │   unit=<Unit.CELLS: 1>,                     │ │
+│ │                        │   │   percent_unit=<Unit.WIDTH: 4>              │ │
+│ │                        │   ),                                            │ │
+│ │                        │   scrollbar_color=Color(0, 48, 84),             │ │
+│ │                        │   scrollbar_color_hover=Color(0, 60, 106),      │ │
+│ │                        │   scrollbar_color_active=Color(1, 120, 212),    │ │
+│ │                        │   scrollbar_corner_color=Color(0, 0, 0),        │ │
+│ │                        │   scrollbar_background=Color(0, 0, 0),          │ │
+│ │                        │   scrollbar_background_hover=Color(0, 0, 0),    │ │
+│ │                        │   scrollbar_background_active=Color(0, 0, 0),   │ │
+│ │                        │   scrollbar_size_vertical=2,                    │ │
+│ │                        │   scrollbar_size_horizontal=1,                  │ │
+│ │                        │   link_color=Color(255, 255, 255, a=0.87),      │ │
+│ │                        │   auto_link_color=True,                         │ │
+│ │                        │   link_background=Color(0, 0, 0, a=0),          │ │
+│ │                        │   link_style=Style(underline=True),             │ │
+│ │                        │   link_color_hover=Color(                       │ │
+│ │                        │   │   255,                                      │ │
+│ │                        │   │   255,                                      │ │
+│ │                        │   │   255,                                      │ │
+│ │                        │   │   a=0.87                                    │ │
+│ │                        │   ),                                            │ │
+│ │                        │   auto_link_color_hover=True,                   │ │
+│ │                        │   link_background_hover=Color(1, 120, 212),     │ │
+│ │                        │   link_style_hover=Style(                       │ │
+│ │                        │   │   bold=True,                                │ │
+│ │                        │   │   underline=False                           │ │
+│ │                        │   )                                             │ │
+│ │                        )                                                 │ │
+│ │                width = 10                                                │ │
+│ │                    y = 0                                                 │ │
+│ ╰──────────────────────────────────────────────────────────────────────────╯ │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widget.py:448 │
+│ 9 in render_line                                                             │
+│                                                                              │
+│   4486 │   │   │   return Strip.blank(self.size.width, self.visual_style.ric │
+│   4487 │   │                                                                 │
+│   4488 │   │   if self._dirty_regions or self._render_cache.size != self.siz │
+│ ❱ 4489 │   │   │   self._render_content()                                    │
+│   4490 │   │   try:                                                          │
+│   4491 │   │   │   line = self._render_cache.lines[y]                        │
+│   4492 │   │   except IndexError:                                            │
+│                                                                              │
+│ ╭────────── locals ──────────╮                                               │
+│ │ self = Counted(id='right') │                                               │
+│ │    y = 0                   │                                               │
+│ ╰────────────────────────────╯                                               │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widget.py:447 │
+│ 1 in _render_content                                                         │
+│                                                                              │
+│   4468 │   │   """Render all lines."""                                       │
+│   4469 │   │   size = self.size                                              │
+│   4470 │   │   width, height = size                                          │
+│ ❱ 4471 │   │   visual = self._render()                                       │
+│   4472 │   │   strips = Visual.to_strips(self, visual, width, height, self.v │
+│   4473 │   │   self._render_cache = _RenderCache(size, strips)               │
+│   4474 │   │   self._dirty_regions.clear()                                   │
+│                                                                              │
+│ ╭───────────── locals ──────────────╮                                        │
+│ │ height = 3                        │                                        │
+│ │   self = Counted(id='right')      │                                        │
+│ │   size = Size(width=10, height=3) │                                        │
+│ │  width = 10                       │                                        │
+│ ╰───────────────────────────────────╯                                        │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widget.py:469 │
+│ 8 in _render                                                                 │
+│                                                                              │
+│   4695 │   │   if cached_visual is not None:                                 │
+│   4696 │   │   │   assert isinstance(cached_visual, Visual)                  │
+│   4697 │   │   │   return cached_visual                                      │
+│ ❱ 4698 │   │   visual = visualize(self, self.render(), markup=self._render_m │
+│   4699 │   │   self._layout_cache[cache_key] = visual                        │
+│   4700 │   │   return visual                                                 │
+│   4701                                                                       │
+│                                                                              │
+│ ╭────────────── locals ───────────────╮                                      │
+│ │     cache_key = '_render.visual'    │                                      │
+│ │ cached_visual = None                │                                      │
+│ │          self = Counted(id='right') │                                      │
+│ ╰─────────────────────────────────────╯                                      │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widgets/_stat │
+│ ic.py:85 in render                                                           │
+│                                                                              │
+│    82 │   │   Returns:                                                       │
+│    83 │   │   │   A rich renderable.                                         │
+│    84 │   │   """                                                            │
+│ ❱  85 │   │   return self.visual                                             │
+│    86 │                                                                      │
+│    87 │   def _render_styles_sensitive(self) -> bool:                        │
+│    88 │   │   """Only original Content has the native rule-measurement contr │
+│                                                                              │
+│ ╭────────── locals ──────────╮                                               │
+│ │ self = Counted(id='right') │                                               │
+│ ╰────────────────────────────╯                                               │
+│                                                                              │
+│ /home/ts/wt/textual-native-subtree-strips-20261002/src/textual/widgets/_stat │
+│ ic.py:64 in visual                                                           │
+│                                                                              │
+│    61 │   │                                                                  │
+│    62 │   │   """                                                            │
+│    63 │   │   if self.__visual is None:                                      │
+│ ❱  64 │   │   │   self.__visual = visualize(self, self.__content, markup=sel │
+│    65 │   │   return self.__visual                                           │
+│    66 │                                                                      │
+│    67 │   @property                                                          │
+│                                                                              │
+│ ╭────────── locals ──────────╮                                               │
+│ │ self = Counted(id='right') │                                               │
+│ ╰────────────────────────────╯                                               │
+╰──────────────────────────────────────────────────────────────────────────────╯
+MarkupError: Expected markup value (found '://example.com]A界BCDEFGH[/link]\n').
+=========================== short test summary info ============================
+FAILED tests/test_compositor_frame_damage.py::test_horizontal_damage_keeps_intervening_native_content_unpainted[regions0]
+FAILED tests/test_compositor_frame_damage.py::test_horizontal_damage_keeps_intervening_native_content_unpainted[regions1]
+2 failed, 14 passed in 4.19s
diff --git a/evidence/native-damage-span-admission-20261005/source-batch02.json b/evidence/native-damage-span-admission-20261005/source-batch02.json
new file mode 100644
index 0000000000..9c09d7ee92
--- /dev/null
+++ b/evidence/native-damage-span-admission-20261005/source-batch02.json
@@ -0,0 +1,18 @@
+{
+  "source": "51f1971c2ea29b443ef15764036fa54b3de51c25",
+  "production_source": "68a9755b411819090283f180a362bf7659757b01",
+  "argv": [
+    "/usr/bin/python",
+    "-m",
+    "pytest",
+    "-q",
+    "tests/test_compositor_frame_damage.py::test_horizontal_damage_keeps_intervening_native_content_unpainted"
+  ],
+  "seconds": 1.6918718189699575,
+  "exit_code": 0,
+  "log": "/home/ts/wt/textual-native-subtree-strips-20261002/.artifacts/native-damage-span-admission-20261005/source-batch02.log",
+  "log_sha256": "96930e0475760ea3818d98efd9c208416bb41c820336d7ab9d9949a8ae04a4ad",
+  "scope": "Only two corrected authored damage-island cases; first batch14PASS/2invalid-markup FAIL remains. Production unchanged; native quoted-link syntax corrected at original fixture, no assertions relaxed.",
+  "installed_qualified": false,
+  "retained_log": "evidence/native-damage-span-admission-20261005/source-batch02.log"
+}
diff --git a/evidence/native-damage-span-admission-20261005/source-batch02.log b/evidence/native-damage-span-admission-20261005/source-batch02.log
new file mode 100644
index 0000000000..773e17c6b9
--- /dev/null
+++ b/evidence/native-damage-span-admission-20261005/source-batch02.log
@@ -0,0 +1,2 @@
+..                                                                       [100%]
+2 passed in 0.40s