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A file-edit diff in the timeline imported Pierre's `FileDiff` directly, so it never received the stylesheet every other diff surface gets. Pierre then painted its own bundled colors, and the diff sat on a fixed blue-black card regardless of the palette in use — the one element in the thread that ignored the theme. Add StyledFileDiff, the inline counterpart to StyledDiffCodeView, and route the timeline's two call sites through it. Both adapters now share one stylesheet, so a palette reaches an inline diff the same way it reaches the panel. Worth knowing: the React FileDiff puts className on the diffs-container element itself, while CodeView puts it on a wrapper. The light-DOM rule has to target the element, not a descendant, or it silently matches nothing and the surface tokens never land. Inline diffs keep a framed card rather than the panel's borderless surface, since they sit inside message chrome instead of owning a viewport. The lint guard that already steered CodeView to the styled adapter now covers FileDiff too, so the raw component cannot quietly come back. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Pierre tokenizes a file diff once on mount and never re-tokenizes. Nothing on the inline path asked for the file's grammar, so a diff mounted before some other surface happened to load that language rendered as plain text and stayed that way for as long as the row was open. That made highlighting a coincidence. A thread whose markdown fences were `ts` got highlighted TypeScript diffs; a thread whose fences were `bash` never did, no matter how long you waited. Even in a lucky thread it was a race — expanding a diff before the fence rendered lost the colour, and collapsing and reopening the row got it back. Gate the diff on its own grammar, derived from the file name, before handing it to Pierre. The unhighlighted diff is the fallback for both waiting and failing: the change itself is what the reader came for, and colour arriving a beat later, or not at all, costs them nothing. Only the first file of a given language waits; after that the promise is cached and nothing suspends. Same shape the markdown code block already uses for this hazard, error boundary included — a cosmetic dependency must not be able to take the surrounding thread down with it. This is not a regression from the theming change. Reverting that change entirely leaves the diff just as plain. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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📝 WalkthroughWalkthroughAdded ChangesStyled file-diff rendering
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The PR is merge-ready after fixing one localized CSS lint error; no actionable merge-blocking risk remains. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant MessagesTimeline
participant StyledFileDiff
participant HighlighterGate
participant PierreFileDiff
MessagesTimeline->>StyledFileDiff: Pass file data and diff options
StyledFileDiff->>HighlighterGate: Request syntax grammar
HighlighterGate-->>StyledFileDiff: Resolve grammar or use fallback
StyledFileDiff->>PierreFileDiff: Render styled file diff
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Inline comments:
In `@apps/web/src/index.css`:
- Around line 2298-2305: Fix the Stylelint declaration-empty-line-before
violation in the diffs-container.styled-file-diff rule by inserting the required
empty line before background-color, after the custom-property declarations.
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apps/web/src/components/chat/MessagesTimeline.tsxapps/web/src/components/diffs/StyledDiffCodeView.tsxapps/web/src/components/diffs/StyledFileDiff.test.tsxapps/web/src/components/diffs/StyledFileDiff.tsxapps/web/src/index.cssvite.config.ts
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apps/web/src/index.css
[error] 2305-2305: Expected empty line before declaration (declaration-empty-line-before)
(declaration-empty-line-before)
🔇 Additional comments (5)
apps/web/src/components/diffs/StyledDiffCodeView.tsx (1)
14-19: LGTM!apps/web/src/components/diffs/StyledFileDiff.tsx (1)
1-66: LGTM!apps/web/src/components/diffs/StyledFileDiff.test.tsx (1)
1-81: LGTM!apps/web/src/components/chat/MessagesTimeline.tsx (1)
46-46: LGTM!Also applies to: 2074-2082, 2524-2532
vite.config.ts (1)
113-115: LGTM!
Thread transfer impact✅ Thread transfer remains within every enforced ceiling.
Baseline: Scenario and decoded snapshot size10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.
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A file-edit diff in the chat timeline imported Pierre's
FileDiffdirectly, so it never got the stylesheet every other diff surface receives, and nothing ever asked for the file's syntax grammar. The result was a fixed blue-black card that ignored the active palette, containing plain untokenised text.Two commits, one per defect.
1. Follow the active theme
StyledFileDiffis the inline counterpart to the existingStyledDiffCodeView, and the timeline's two call sites now go through it. Both adapters share one stylesheet, so a palette reaches an inline diff the same way it reaches the panel.The subtle part: the React
FileDiffputsclassNameon thediffs-containerelement itself, whileCodeViewputs it on a wrapper. A descendant selector silently matches nothing — caught only by measuring the rendered element, not by reading the code.The lint guard that already steered
CodeViewto the styled adapter now coversFileDifftoo.2. Highlight the file's own language
Pierre tokenises once on mount and never re-tokenises. Nothing on the inline path requested the grammar, so highlighting was a coincidence: a thread whose markdown fences happened to be
ts got highlighted TypeScript diffs, and a thread whose fences werebash never did. Even in a lucky thread it was a race — expanding a diff before the fence rendered lost the colour.The diff is now gated on its own grammar, derived from the file name. The unhighlighted diff is the fallback for both waiting and failing, matching the pattern the markdown code block already uses, error boundary included.
This one is not a regression from the theming commit; reverting that change entirely leaves the diff just as plain.
Screenshots
The same diff, same thread, under Rosé Pine Dawn. A warm page leaves the unthemed card's hard white and grey slab separators nowhere to hide; Catppuccin Mocha is included to show dark themes follow too.
Highlighting, with the inline diff and the panel side by side and both tokenised:
Verification
Measured in a real client against Catppuccin, not read off the source.
--diffs-bg: #0a0a0a, radius0px--code-backgroundexactly, radius8pxbash/textfences,.tsdiffstsfence, diff opened immediatelyAlso checked and found sound: switching appearance with a diff open re-tokenises correctly; long lines still scroll horizontally inside Pierre's own scroller; extensionless paths (
LICENSE,bin/t3code) resolve totextand degrade gracefully.Tests: 42 across
components/diffsandMessagesTimeline. The four language cases were confirmed non-vacuous — they fail if the gate stops deriving from the file name.Model: Claude Opus 5 (1M context), via T3 Code.
Summary by CodeRabbit
New Features
Bug Fixes
Tests