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[Bug]: Question card jumps between expanded and collapsed layouts when the pointer hovers an option with a preview

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
72/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
react, typescript
Domain
frontend

Research direction

Start in apps/web and read ComposerPendingUserInputPanel.tsx, where the issue says the option preview is rendered and focusedOption controls it. Reproduce with an AskUserQuestion containing options with and without previews, then inspect how the card behaves as the pointer moves. Done means the card and thread stay in place while moving over options, with any preview remaining usable.

Written by the indexing model from the issue text.

Description

Area

apps/web

Steps to reproduce
  1. Run a Claude thread where the agent calls AskUserQuestion with 2+ options. At least one option, the first here, has a preview. The others have none.
  2. Wait for the pending question card above the composer.
  3. Move the pointer over the card and the options.
Expected behavior

The card keeps its height. The surrounding thread view stays still while the pointer moves over the options.

Actual behavior

When the pointer reaches an option, the card grows to include the preview pane ("Preview · Update all 3 parts (Recommended)").

  • The card now fills most of the visible area.
  • The "Ran 1 command" row and the agent's text above the card are pushed out of view.
  • The card gets its own inner scrollbar.

A moment later the card snaps back to its small layout, and the preview is gone. In the 14 s recording the card is small until t≈8s, expanded from t≈8s to t≈11s, and small again at t≈12s. The pointer barely moves.

Likely cause (not verified)

Introduced by #21933 (fix(clients): show question option previews), which was reverted in #22229. In ComposerPendingUserInputPanel.tsx, the preview section is rendered below the option list and sized by its content. Hovering sets focusedOption, which picks the preview. Options without a preview remove the section again. So growing and shrinking the card moves the options under a stationary pointer. That changes which option is hovered, which changes the preview, and the loop repeats.

If the preview is re-landed, reserve a fixed-height slot for it, or don't make the preview depend on hover.

Impact

Cosmetic issue. The card is hard to read and click while it moves, and the thread content jumps.

Environment

macOS (Darwin 27.0.0), T3 Code build containing #21933 (before the revert), Claude Opus 5.5, Extra High effort, Full access.

Screenshots, recordings, or supporting files

Screen recording (14 s) to follow in a comment.

Dominant language
TypeScript
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Merged PRs (30d)
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