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Chromium keeps a run of wheel events on the scroller it started on, so a tool group that reaches its top mid-run swallows the rest of the run. Decide the timeline target once per run instead of once per event.
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ApprovabilityVerdict: Would Approve Macroscope's review found this PR approvable — This is a contained web bug fix that aligns existing timeline navigation and composer-collapse handling with browser wheel transactions. It adds focused helper logic and tests without introducing a new capability, schema, product-default, infrastructure, or static-analysis change. Not approved because:
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Included review availability: Your plan provides up to 10 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughTimeline wheel events now use a latched target decision across a wheel run. ChatView retains the latch across listener effect reattachments and resets it when the active thread changes. ChatComposer updates the latch only for events inside the timeline. ChangesTimeline wheel latching
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to The wheel-run change is mergeable with normal checks; no concrete unresolved failure was established. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Actionable comments posted: 2
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Inline comments:
In `@apps/web/src/components/chat/ChatComposer.tsx`:
- Line 4892: Update handleTimelineWheel to check whether event.target is inside
scrollNode before calling latchTimelineWheelTarget, and return for outside
events unless collapseSuppressed is active. For outside events that must be
processed under that exception, do not update the timeline latch; only latch
events inside the timeline.
In `@apps/web/src/components/ChatView.tsx`:
- Line 5470: Keep the wheel latch across listener-effect reattachments by
storing it in a ref in ChatView and using that shared latch in the wheel handler
instead of creating it inside the effect. Reset the ref only when
activeThread?.id changes, so inset-driven reattachments preserve the current
wheel run’s target.
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apps/web/src/components/ChatView.tsxapps/web/src/components/chat/ChatComposer.tsxapps/web/src/components/chat/timelineScrollTarget.test.tsapps/web/src/components/chat/timelineScrollTarget.ts
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ChatView's listener effect reattaches when the composer inset changes, which dropped its latch mid-run; keep it in a ref reset per thread. The composer's document listener no longer lets events outside the timeline start or extend a run.
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Both fixed in dfb24ac. ChatView's latch now lives in a ref that survives the listener reattaching and resets per thread. The composer's document listener only lets events inside the timeline start or extend a run. |
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Note This comment is posted by Julius' dot The Edge measurements are useful, but no recording shows this change with real wheel input. The verification rule requires evidence of timing-dependent interactions. Please attach a short before/after recording showing a nested scroller reaching its edge within one wheel run, then a new run after a pause, with timeline movement and composer/follow behavior visible. Request reconsideration once that evidence is attached. |
2 participants
Problem
#13167 stopped the composer from collapsing when a wheel scrolls a nested tool group, but it decides per wheel event. Chromium doesn't. It keeps a run of wheel events on the scroller where the run started. So when a tool group reaches its top partway through a run, the rest of the run goes nowhere and the timeline doesn't move. The per-event check sees the group at its edge and counts those events as timeline scrolling. The composer collapses and live follow stops while the timeline stays still.
Repro (Chromium, physical mouse wheel): scroll up over a tool group that has its own scroller, keep turning the wheel past the group's top in one motion.
Change
latchTimelineWheelTargetdecides once per run, on the first vertical event, and keeps that answer until wheel events stop for 500 ms (Chromium's wheel transaction timeout). The composer's collapse and ChatView's follow opt-out both use it. Keyboard scrolling is unchanged.Scope and approval
A focused follow-up to #13167, which established the problem and the intended behaviour; this corrects one case that fix still misses. No new behaviour beyond what #13167 intended.
Verification
Measured in Edge with OS wheel input, scrolling up over a nested scroller inside an outer one, using this module's code:
Clicks injected through DevTools skip this latching, which is why a DevTools-driven test doesn't reproduce the bug. The last test in
timelineScrollTarget.test.tsexpected a collapse within the same run after the group reached its top; it now expects the collapse on the next run.vp test run apps/web/src/components/chat/timelineScrollTarget.test.ts, with this PR merged onto currentmain(5cc99e1c23): 17 of 17 pass. The same file againstmainwithout the source changes: 4 fail, including "does not accumulate nested scrolling toward composer collapse" and "keeps a run on a nested group after the group reaches its edge".Summary by CodeRabbit