[giswqs]

Cause

settling_after_a_camera_animation_re_renders_fully (crates/ui-egui/tests/gpu_fastpath.rs) has failed on main's macOS, Windows and Windows ARM runners since #1775 (run 42988719771 on 38e3f43, again in run 43009279677 on b36dc38). It read the full frame's camera five UI steps after the camera animation ended. Since #1775, a flat north-up map's settled frame is drawn off the UI thread, so after five steps it had not arrived and the test saw the previous frame's camera (res 25721.55 instead of 5888.19). The map itself is right: the settled frame does come. Linux runners have no GPU adapter, so the test returns early there and the PR's CI did not catch it.

Fix

Wait for the settled frame with the file's own wait_for_frame (worker results, tiles and GPU uploads, with a 60 s hang guard) before comparing, as the other tests in the file do. The assertion is unchanged.

Evidence

On a Linux machine with a GPU: on main the test fails with the same values as CI (left res 25721.55, right 5888.19); with this change all 7 tests in gpu_fastpath pass. Labelled ci:full so the macOS and Windows jobs run here.

The other failure in run 43009279677, archive_render_revision::a_reload_between_series_pages_refuses_the_engine_pdf_without_replacing_destination on Windows ARM, is an older intermittent failure that predates #1775; #1765 (issue #1761) is fixing it.

Summary by CodeRabbit

• Tests
  • Updated the camera animation settling check to wait for a frame before verifying that the full-frame camera matches the settled camera.

[coderabbitai]

Walkthrough

The camera animation test now calls wait_for_frame after the animation settles, before it checks that the full-frame camera matches the settled camera.

Changes: GPU frame readiness

Layer / File(s)	Summary
Settled frame check crates/ui-egui/tests/gpu_fastpath.rs	The test replaces five additional UI steps with wait_for_frame before checking the full-frame camera.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Possibly related PRs

• opengeos/RustGIS#793: Updates wait_for_frame to keep painting while tile uploads remain in progress.
• opengeos/RustGIS#791: Updates wait_for_frame to require idle drawing, no in-flight tiles, and stable tile-cache generation.
• opengeos/RustGIS#1504: Changes GPU frame settling and wait_for_frame behavior in the same test file.

Suggested labels: ci:windows

Suggested reviewers: sheecegardezi

Merge Risk: Minimal · up to 4591b

This is a test-only fix for a flaky or failing GPU test. It does not change production behavior, and no merge-blocking risk remains.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly describes the main change: the GPU settle test now waits for the off-thread settled frame.
Description check		The description is detailed and relevant. It explains the cause, fix, unchanged assertion, test evidence, affected runners, and related issues. It uses Cause, Fix, and Evidence headings instead of the…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description is detailed and relevant. It explains the cause, fix, unchanged assertion, test evidence, affected runners, and related issues. It uses Cause, Fix, and Evidence headings instead of the template headings, and it does not explicitly include the required no-visible-UI statement.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 1 functions across 1 files.

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

Finishing Touches

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_{A rabbit waits while frames take flight
The camera settles into sight
One frame arrives; the check is done
No five more steps are needed, bun
I twitch my nose and hop away}

[github-actions]

Code review

I found no bugs, security issues, or performance problems. This is a two-line change to one test, and I checked the new wait against the code it depends on. I did not run the tests, because I have no shell here. The PR's claim that all 7 gpu_fastpath tests pass on a GPU machine is therefore unverified by me.

Bugs

• None found. The old fixed loop of 5 h.step() calls is replaced by wait_for_frame, which waits for the off-thread settled frame. Its exit condition is !drawing() && in_flight() == 0 && generation() stable. drawing() is tilt_settle.busy() || filling (crates/ui-egui/src/mapview.rs:493). The worker's settle window is 0.18 s for a flat map (0.4 s when pitched), which is about 11 harness steps at 1/60 s, so the 40 initial steps in wait_for_frame cover it. Confidence: high.
• If the settled frame were never requested, wait_for_frame would return early and the assertion would fail. That is a real check, not a vacuous pass. Confidence: high.

Security

• None. The change is test-only and adds no input handling.

Performance

• None. The fixed 5-step loop is replaced by a wait that can run longer, but only on the slow GPU path and under the existing 60 s hang guard. Confidence: high.

Quality

• The PR body says the regression came "since UI: draw a flat map's settled frame off the UI thread (#1750) #1775". The test comment (crates/ui-egui/tests/gpu_fastpath.rs:110) and the repo's own comments (crates/ui-egui/src/mapview.rs:5182, crates/ui-egui/src/tilt_settle.rs:1) cite Smooth panning and zooming with detailed layers: off-thread frames, shape-aware thinning, outline levels #1750 for the off-thread flat-map frame. One of these numbers is probably wrong. This is a PR-description fix, not a code change. Confidence: medium, about 60%.
• The test still does not run on Linux CI, which has no GPU adapter. The PR body says so, and the ci:full label covers macOS and Windows. Confidence: high. No change requested.

AGENTS.md

• Compliant. The change adds no non-test unwrap, expect, or panic, and no new layer dependency. It keeps the existing wait_for_frame helper and the file's test conventions.

Prior reviews

• No review threads on this PR, so there were no earlier concerns to skip.

Change size

Compared with the base branch: the whole PR against main (merge base b36dc38 to PR head 4591b26).

Measure	Value
Files changed	1 (added 0, modified 1, removed 0, renamed 0)
Size before	20.7 KB
Size after	20.8 KB
Total size change	+77 B

Path	Before	After	Change
crates/ui-egui/tests/gpu_fastpath.rs	20.7 KB	20.8 KB	+77 B

[coderabbitai]

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Failed pre-merge checks:
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Write docstrings for the functions missing them to satisfy the coverage
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• crates/ui-egui/tests/gpu_fastpath.rs

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[github-actions]

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Item	Value
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