fix(web): find bar and thread details panel stop covering each other

[MatthewFeroz]

Problem

The "Find in thread" bar and the thread details panel both sit in the top-right of the chat, and neither accounted for the other.

• The bar was 24rem wide and the panel is 280px, so their edges never lined up.
• In a narrow window the panel opens as a dropdown under the header button. Opening find closed that dropdown. Reopening it drew it over the bar and its close button, so the X could not be clicked.
• With both open, clicking the bar's X or input counted as a click outside the dropdown and closed it.
• The floating preview could be dragged over the bar. It already kept clear of the inline panel, but not of the bar. Docked there, its own close button sits right on top of the bar's X, so clicking the X closed the preview instead of the search.

Change

The bar and the panel now share the corner. The bar takes the panel's width from --thread-details-panel-width, and the panel moves down to make room for it.

• Dropdown panel. It stays open when find opens. It sits below the bar and slides there over 150ms while the bar fades in, so the two never overlap. Clicks and focus inside the bar no longer dismiss it. Escape still does, one layer at a time. The panel popover variant now sizes its popup so the card inside matches the bar's width and edges, including on very narrow canvases.
• Inline panel. It is now anchored to the canvas's right edge with CSS, the same way as the bar, so both follow a resize in the same frame. It slides down when find opens and snaps back when find closes. If it slid back up, a floating preview docked below it would move up instantly and overlap it mid-slide.
• Same-frame timing. The find provider reports its open state before paint, so the panel makes room in the same frame the bar appears.
• Floating preview. The chat canvas layout treats the open bar as an obstacle for preview drags and resizes. Chat itself does not move for it.

The removed ChatView effect is what closed the dropdown when find opened. Its comment gave the overlap as the reason, and the overlap no longer happens.

Scope

No issue was filed first. I'm treating this as a focused fix for one visible defect, which is two overlays and the floating preview colliding in the same corner. Every change here exists so the find bar and the things around it stop covering each other.

Verification

I worked on main c77a7b7eeb in an isolated web dev client in T3 Code's browser panel, then rebased onto a11f464133. Most checks used the narrow dropdown layout at 972px, and the rest used wider sizes. I logged element positions on every animation frame instead of judging by eye.

• The panel and bar edges match in both modes. They still match with the right panel open and on a 288px canvas.
• With the dropdown open, opening find slides the panel from 60 to 108px while the bar fades in. No frame shows the panel covering the bar. This also holds when the dropdown was opened from the keyboard, where Base UI sets data-instant.
• With both open:
  • Clicking X, an arrow or the input keeps the dropdown open.
  • Clicking the composer closes it.
  • Escape clears the query, then closes the dropdown, then closes find.
  • Tab and Shift+Tab move between the bar and the composer without closing anything.
• A floating preview dragged into the top-right docks 12px below the bar, or below the inline panel when that is open. Toggling find while the preview is docked never overlaps the bar or panel in any frame.
• Every way out works with the preview docked under the bar, and the bar's X stays clickable throughout:
  • The bar's X and Escape close find, and the preview moves up into the space. Cmd+F brings the bar back and the preview moves down again.
  • The preview's own close button closes only the preview. Find stays open.
  • "Open preview in right panel", Cmd+Shift+J and closing the right panel move the preview between the panel and the chat. The bar follows the chat's edge each time, and a re-floated preview never covers it.
  • Closing the inline panel lets a preview docked under it move up to just below the bar.
• Nothing overlapped or drifted out of line in any sampled frame while:
  • toggling the right panel
  • dragging the sidebar wider, across 123 frames
  • switching to a draft and back
  • blurring and focusing the window
  • opening a second window on the same thread
• vp test run src/components/chat/chatCanvasLayout.test.ts src/components/chat/threadDetailsCardLayout.test.ts src/components/chat/ThreadFindProvider.test.tsx src/components/chat/useThreadFind.test.tsx in apps/web passes all 54 tests. The new find-bar obstacle test fails on main, where the preview lands at y=12 over the bar, and passes here at y=60.
• tsc --noEmit passes for web, and targeted lint reports no errors.

What I didn't check, and what's still open:

• I didn't run the packaged desktop app, so its native preview webview wasn't exercised. Its frame comes from the same layout code.
• Mobile uses its own native UI and isn't affected.
• A floating preview resized taller than the space below the bar can still cover it. Fixing that means shrinking the preview, which felt like a bigger change than this PR should make.
• The floating preview draws above the dropdown panel. That happens with or without find, and this PR leaves it alone.

Evidence

Narrow window, details panel as a dropdown. Steps: open the panel, press Cmd+F, then press X on the search bar.

Before. Cmd+F closes the panel, and reopening it covers the bar and its X.

After. The panel slides below the matching bar, then slides back up and stays open when X is pressed.

Find open, floating preview dragged into the top-right.

Before. It docks over the bar.

After. It docks just below the bar.

Closing things with the preview docked in the corner.

Before. Clicking the bar's X hits the preview's close button instead and closes the preview. It takes a second click to close find.

After. The X closes find and the preview moves up. Cmd+F brings find back and the preview moves down. The preview's own close button closes just the preview.

Model: claude-opus-5-5, with code review by gpt-6-astra. Harness: Claude Code in T3 Code.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This fix coordinates find-bar, thread-panel, and floating-preview behavior across several production layout and interaction components, including a shared popover primitive. The tests are targeted, but the cross-component runtime changes and animation/focus semantics warrant human review.

^{You can add or adjust custom eligibility rules. Learn more.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 247568c and f96d2ae.

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📒 Files selected for processing (5)

• apps/web/src/components/chat/ChatCanvas.test.tsx
• apps/web/src/components/chat/ChatCanvas.tsx
• apps/web/src/components/chat/chatCanvasLayout.test.ts
• apps/web/src/components/chat/chatCanvasLayout.ts
• apps/web/src/components/chat/threadDetailsCardLayout.ts

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📝 Walkthrough

Walkthrough

The thread find bar now shares layout space with the thread details card and floating previews. The changes update card positioning, find-bar open-state handling, panel popover styling, and preview obstacle resolution.

Changes

Thread find-bar layout

Layer / File(s)	Summary
Find-bar and details-card behavior apps/web/src/components/ChatView.tsx, apps/web/src/components/chat/ThreadDetailsCard.tsx, apps/web/src/components/chat/ThreadFindBar.tsx, apps/web/src/components/chat/ThreadFindProvider.tsx, apps/web/src/components/chat/threadDetailsCardLayout.ts, apps/web/src/components/chat/threadDetailsCardLayout.test.ts, apps/web/src/components/ui/popover.tsx	The find bar uses a positioned wrapper with an opacity transition. Its open-state callback runs in a layout effect, and find-bar focus-out or outside-press events do not close the details popover. The card uses the canvas top inset and a right inset. Panel popovers use updated width and collision settings, and animate top-position changes unless reduced motion is enabled.
Floating-preview obstacles apps/web/src/components/chat/ChatCanvas.tsx, apps/web/src/components/chat/chatCanvasLayout.ts, apps/web/src/components/chat/chatCanvasLayout.test.ts, apps/web/src/components/chat/ChatCanvas.test.tsx	The canvas measures the find bar when the top inset is positive and passes its bounds to layout resolution. Drag and resize previews are positioned around the find bar. Tests cover preview placement, open and close behavior, and font-size changes.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Suggested reviewers: juliusmarminge

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Merge Risk: ⚪ Minimal · up to f96d2

The change keeps the find bar, details panel, and floating previews from covering each other. No merge-blocking issue was identified in the supplied evidence.

Pre-merge checks | 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check		The title is concise, conventional, and clearly describes the main fix: preventing the find bar and thread details panel from covering each other.
Description check		The description includes complete Problem, Change, Scope, Verification, and Evidence sections. It explains the focused scope, detailed test results, UI behavior, evidence, and known limitations.
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.

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[coderabbitai]

Actionable comments posted: 2

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Inline comments:
Review comments at @apps/web/src/components/chat/ChatCanvas.tsx:
- Around line 102-124: Update the findBar obstacle calculation in the ChatCanvas
layout flow to use the bar’s actual rendered bounds relative to the canvas,
including its rendered bottom edge, instead of using detailsCardTopInset as its
bottom coordinate. Pass those canvas-relative bounds to resolveChatCanvasLayout
so preview clamping avoids the entire bar.

Review comments at @apps/web/src/components/chat/ThreadDetailsCard.tsx:
- Around line 162-173: Update the find-bar geometry used by
resolveThreadDetailsCardLayout and ChatCanvas so the card inset and obstacle
rectangle both derive from the rendered bar bounds, including its rem-scaled
height and width, instead of fixed reserved-height and obstacle-width values.
Reuse the same resolved bar rectangle for both calculations; keep the card’s
existing placement formula.

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📥 Commits

Reviewing files that changed from the base of the PR and between cfbd145 and 247568c.

📒 Files selected for processing (10)

• apps/web/src/components/ChatView.tsx
• apps/web/src/components/chat/ChatCanvas.tsx
• apps/web/src/components/chat/ThreadDetailsCard.tsx
• apps/web/src/components/chat/ThreadFindBar.tsx
• apps/web/src/components/chat/ThreadFindProvider.tsx
• apps/web/src/components/chat/chatCanvasLayout.test.ts
• apps/web/src/components/chat/chatCanvasLayout.ts
• apps/web/src/components/chat/threadDetailsCardLayout.test.ts
• apps/web/src/components/chat/threadDetailsCardLayout.ts
• apps/web/src/components/ui/popover.tsx

💤 Files with no reviewable changes (1)

• apps/web/src/components/ChatView.tsx

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