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ApprovabilityVerdict: Needs Human Approval Macroscope's review found this PR requires human approval — This PR materially changes the existing citation-selection workflow, including selection clipping semantics, scroll/resize persistence, and shared popover positioning across the chat UI. The behavior is well tested but spans several production components and is not limited to a small isolated layout correction. You can add or adjust custom eligibility rules. Learn more. |
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📝 Walkthrough
Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Out of Scope Changes check |  |
The active linked issue is [#22109]. The PR also changes behavior not required by that issue. captureAssistantTextSelection clips selections that leave the originating response. `observeSelectionAct… |
Limit this PR to the [#22109] citation-popover positioning and horizontal-layout fix, or link active issues and obtain approval for the added selection clipping, scrolling, off-screen Cite, and composer-boundary behavior. |
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Check name Status Explanation Description check The description includes all required sections. It explains the problem, change, scope and approval status, verification steps, test results, limitations, screenshots, recording, and agent details. Title check The title clearly and concisely describes the main change: keeping citation controls inside the visible message area. Linked Issues check Issue [ #22109] requires the citation comment popover to remain inside the visible pane for wide code lines and to avoid horizontal layout shifts.assistantCitationAnchorRectselects a visible range …Full details: Linked Issues check
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Explanation
Issue [
#22109] requires the citation comment popover to remain inside the visible pane for wide code lines and to avoid horizontal layout shifts.assistantCitationAnchorRectselects a visible range rectangle and clamps the anchor to the viewport and source bounds.AssistantCitationChippasses the timeline boundary, enables sticky positioning, and supplies it as the collision boundary. The reported browser tests cover wide lines, selection directions, scrolling, typing, and resizing.
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Full details: Out of Scope Changes check
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Explanation
The active linked issue is [
#22109]. The PR also changes behavior not required by that issue.captureAssistantTextSelectionclips selections that leave the originating response.observeSelectionActionspreserves and repositions actions during scrolling. The timeline boundary keeps Cite and the editor above the composer, and the PR keeps Cite for fully off-screen selections. The PR description states that these broader behaviors lack maintainer approval.Resolution
Limit this PR to the [
#22109] citation-popover positioning and horizontal-layout fix, or link active issues and obtain approval for the added selection clipping, scrolling, off-screen Cite, and composer-boundary behavior.
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Actionable comments posted: 1
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Inline comments:
Review comments at @apps/web/src/lib/assistantTextSelection.ts:
- Around line 224-228: Update captureAssistantTextSelection around
selectedTextBoundary so backward selections do not stop at the first selected
text node outside a citation source. Enumerate citation-source elements in
viewport order, retain candidates whose selectedTextBoundary is non-null, and
choose the last candidate for backward selections or the first for forward
selections; preserve the existing null and viewport containment checks.
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📒 Files selected for processing: 12
apps/web/src/components/chat/AssistantCitationChip.tsxapps/web/src/components/chat/AssistantCitations.browser.test.tsxapps/web/src/components/chat/AssistantSelectionToolbar.tsxapps/web/src/components/chat/ChatCanvas.tsxapps/web/src/components/chat/ChatCanvasContext.tsapps/web/src/components/chat/MessagesTimeline.tsxapps/web/src/components/ui/popover.tsxapps/web/src/lib/assistantCitationPosition.tsapps/web/src/lib/assistantTextSelection.test.tsapps/web/src/lib/assistantTextSelection.tsapps/web/src/lib/selectionActions.test.tsapps/web/src/lib/selectionActions.ts
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3 participants
Problem
Citation controls can leave the visible message area when selecting a long response or wide code line. Upward selections can also lose Cite when the drag ends outside the response, and scrolling dismisses the action even while text remains selected.
Fixes #22109.
Change
Keep both Cite and its comment editor inside the visible timeline above the composer. The controls share a bounded selection anchor, follow scrolling and resizing, and preserve the quoted text while the comment is edited. Clip a selection released outside the response to its originating message.
The shared popover exposes the existing Base UI boundary and sticky options. Web and desktop use this client code; no wire or provider changes are needed.
Scope and approval
#22109 is accepted for horizontal comment-popup overflow. The maintainer confirmed the off-screen anchor in this comment.
This broader proposal also changes intentional upstream behavior. #15818 hides Cite when the selection is fully off screen; this change keeps it clamped to the visible message area. It also clips selections released outside their originating response rather than rejecting cross-response selections. These additional behaviors have not received maintainer approval. The scope request and supporting evidence are at #22109 (comment).
Related PRs #22126 and #22149 both address the original horizontal-popup report. #22126 enables Base UI sticky positioning; #22149 clamps the last selection rectangle horizontally. Neither changes Cite, selection capture, or the selection-scroll observer. This proposal additionally bounds both controls above the composer and changes the scroll/selection behavior described above. This does not imply that the other PRs fail at their stated scope.
Verification
Claude Opus 5.5 completed two full reviews and a final review of the source-unmount cleanup in the original implementation, with no remaining code blockers.
The citation browser tests use real controls, native selections, and disposable fixtures. Native-event waits are bounded and remove their listeners even on failure. Timer/frame races use a fake clock and assert that Cite actually appears. The capture tests also verify which response owns the quote.
The six focused suites pass all 133 tests. The web typecheck and scoped formatting/lint checks pass. Four negative controls confirm the relevant tests fail when pending capture, popup boundaries, source-removal cleanup, or metadata-origin handling is broken. No retries or longer test timeouts were added.
The desktop shell and macOS-specific rendering were not re-tested; the integrated pass used the real shared web client on Linux.
Before screenshots supplied by the person reporting the desktop selection problem. The exact desktop build was not supplied:
After frame from the recording:
After recording, 11.5 seconds covering both selection directions, a wide line, scrolling and typing:
citation-after.mp4
Evidence files on GitHub.
Implemented by GPT-6.1-Sol through Codex in T3 Code. Original implementation reviewed by Claude Opus 5.5 through Claude Code in T3 Code.