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fix(ui): keep scrollbar thumbs one width with a minimum length #1069

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Merged
PathGao merged 1 commit into from
Nov 8, 2026
Merged

fix(ui): keep scrollbar thumbs one width with a minimum length #1069

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17 changes: 2 additions & 15 deletions src/lib/components/Editor.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -923,22 +923,9 @@
min-width: 0;
}

/* Monaco sizes the slider inline. Grow it under the pointer the way the
preview's thumb does. */
/* Same corner as the preview's thumb in styles.css. */
.editor-container :global(.monaco-scrollable-element > .scrollbar > .slider) {
border-radius: 10px;
}

.editor-container :global(.monaco-scrollable-element > .scrollbar.vertical > .slider:hover),
.editor-container :global(.monaco-scrollable-element > .scrollbar.vertical > .slider.active) {
width: 12px !important;
left: 1px !important;
}

.editor-container :global(.monaco-scrollable-element > .scrollbar.horizontal > .slider:hover),
.editor-container :global(.monaco-scrollable-element > .scrollbar.horizontal > .slider.active) {
height: 12px !important;
top: 1px !important;
border-radius: 4px;
}

:global(.ghost-caret) {
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4 changes: 2 additions & 2 deletions src/lib/utils/editorOptions.ts
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Expand Up @@ -237,8 +237,8 @@ export function createdEditorOptions(
// Same track and thumb as the preview's ::-webkit-scrollbar in styles.css.
verticalScrollbarSize: 14,
horizontalScrollbarSize: 14,
verticalSliderSize: 8,
horizontalSliderSize: 8,
verticalSliderSize: 12,
horizontalSliderSize: 12,
},
};
}
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13 changes: 8 additions & 5 deletions src/styles.css
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Original file line number Diff line number Diff line change
Expand Up @@ -211,19 +211,22 @@ body {
background: transparent;
}

/* 8px at rest, 12px under the pointer, between the Windows and macOS thumbs.
Keep in step with the Monaco scrollbar in Editor.svelte. */
/* A 12px thumb that keeps its width and only darkens under the pointer, as
Monaco's does, with Fluent's 4px control corner (5px less the 1px
transparent border). 22px is Monaco's 20px minimum slider length plus that
border at each end. Keep in step with the Monaco scrollbar in Editor.svelte. */
::-webkit-scrollbar-thumb {
background-color: rgba(120, 120, 120, 0.35);
border-radius: 10px;
border: 3px solid transparent;
border-radius: 5px;
border: 1px solid transparent;
background-clip: content-box;
min-width: 22px;
min-height: 22px;
}

::-webkit-scrollbar-thumb:hover,
::-webkit-scrollbar-thumb:active {
background-color: rgba(120, 120, 120, 0.55);
border-width: 1px;
}

.markdown-body {
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