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- 🪄 Fix CodeRabbit comments on this PR
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In `@apps/web/src/components/chat/ComposerSurface.tsx`:
- Line 88: The mask utilities in ComposerSurface reference
--spacing-composer-seam, which may not be emitted from an inline theme. Declare
this token in a static theme and remove its inline-theme declaration so both
mask positions resolve.
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apps/web/src/components/chat/ComposerSurface.tsxapps/web/src/index.css
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ApprovabilityVerdict: Approved at Macroscope's review found this PR approvable — This is a small, localized web UI fix that adjusts an existing mask by one pixel to remove a visual seam between the composer and toolbar. It introduces no new workflow, data/API change, product default, or static-analysis override. You can add or adjust custom eligibility rules. Learn more. |
Stop the context strip's lower backdrop mask one CSS pixel above the seam, so it overlaps the composer and no gap shows when an attached banner splits the backdrops. Co-authored-by: Codex <noreply@openai.com> Co-authored-by: Claude <noreply@anthropic.com> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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What Changed
The bottom toolbar's backdrop mask now starts one CSS pixel higher, under the composer. Both lower mask stops use a new
--spacing-composer-seamtoken, defined ascalc(var(--spacing) * 4 - 1px). The dark background gradient keeps its position. The diff also adds one-line doc comments to the threeComposerSurfacewrappers.Why
Fixes #12937.
With an attached banner and the composer collapsed, scrolling conversation text showed through a thin gap between the input and the bottom toolbar. The mask ended exactly on the seam. The upper banner seam already uses the same one-pixel overlap.
UI Changes
Before: a thin sliver of sharp conversation text is visible at the lower join. After: the join stays continuous in the tested states.
Before:

After:

Both were captured at the same scroll position and display scale, with slightly different crop bounds. Recordings did not reliably preserve the one-pixel sliver, so no video is attached.
Validation
371b52d9dad76876f84609a4cd0f80eaa757b69c. The branch was later merged with main at6989856aand moved to the token. No manual visual pass was repeated after that.apps/web/src/index.csswith@tailwindcss/node4.3.3 emits the token, and both mask positions reference it.50647de0(Oct 10) as a single commit. Main still places both mask stops on the seam (calc(var(--spacing) * 4)); on the rebase, compiled CSS emits the token and both stops use it. Web typecheck, lint, and formatting pass. No manual visual pass was repeated after the rebase.Not tested: a packaged desktop build, standalone browsers, macOS, Linux, and mobile. Open PR #8034 changes how timeline content fades beneath the composer. This change is limited to the lower toolbar mask.
Checklist
Model: GPT-6-Astra, Claude Fable 5.1 (review), Claude Opus 5.5 (rebase). Harness: Codex, Claude Code.
Summary by CodeRabbit