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Rows away from the viewport rendered a different tree from the swipeable row, so waking one remounted its content the moment the list came to rest or a finger lifted. The favicons reloaded (a visible flash) and a tap that landed on the old views was dropped before it reached the row. Dormant rows now keep the swipeable tree with the gesture disabled and no action buttons, so waking a row only adds its actions.
Every Home row now renders the swipeable, and keying it by resetKey rebuilt the whole row, favicons included, each time the list reused it for another thread while scrolling. The row now resets its swipe and animation state when resetKey changes.
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughSwipe rows retain the same row tree while dormant. Recycled rows reset their swipe and animation state in place. Dormant rows disable swipe activation and omit right-side actions. ChangesSwipe row lifecycle
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to No merge-blocking issue was identified; the recycled-row dismissal path is guarded against a late restore. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to Dormant rows still block swipe actions, and dismissal cleanup is tied to the row’s current content. A limited uncertainty remains about late swipe callbacks when a row is reused; no security issue was verified. Retained concerns
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @apps/mobile/src/features/home/thread-swipe-actions.tsx:
- Line 474: When props.dormant becomes true, reset the ReanimatedSwipeable row
so it does not retain an offset after its actions are hidden. Add an effect tied
to props.dormant that calls reset on the swipeable ref only when the row becomes
dormant.
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apps/mobile/src/features/home/HomeScreen.tsxapps/mobile/src/features/home/swipe-row-activation.tsapps/mobile/src/features/home/thread-swipe-actions.tsx
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ApprovabilityVerdict: Would Approve Macroscope's review found this PR approvable — This is a localized mobile bug fix that keeps recycled Home-row content mounted while preserving swipe actions for active rows and resetting row state in place. A medium-severity finding flags a possible stale dismissal restoration during recycling, which remains a notable correctness risk. Not approved because:
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- A late restore from the previous content's dismissal no longer resets the row once the list has reused it for other content. - A row that goes dormant while open now closes. - Resetting a row that was open also turns off its tap-to-close gesture, which reset() left on and which cancelled the next press on the row.
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What Changed
Home rows away from the viewport (#13702) now render the same tree as the swipeable row instead of a separate plain frame.
thread-swipe-actions.tsx:ReanimatedSwipeable, with the swipe gesture off and no action buttons. Waking it turns the gesture on and adds the actions, so the row's content stays mounted.resetKey. When the list reuses it for another thread, it resets in place: it cancels its animations, finishes a pending dismissal and resets the swipe, the same steps an unmount took.swipe-row-activation.tsandHomeScreen.tsxnow describe dormant rows accurately.Why
Since #13702, a row switched from the plain frame to the swipeable row when the list came to rest or a finger lifted. That remounted the row's content:
Keeping one tree fixes both. Keying the always-rendered swipeable by
resetKeywould instead rebuild every recycled row while scrolling. That cost 4.8% janky frames against 3.6% in the same A/B, so the row resets in place instead.Pixel 9, real account, release builds installed in place. Both builds are my test build (main plus unrelated local changes) and differ only by this PR.
gfxinfo)Taps at 0.8–0.9 s mostly land while the list is still moving, and stopping it is expected. Most misses left at about 1.0 s are fixed by the PR stacked on this one. The JS bundle grows by 63 bytes.
The existing Home tests pass. The change is to the render tree, so the evidence is the on-device measurement above.
UI Changes
The same fling, then a tap on a row about 1.15 s later. On the left is my test build before this PR: the rows remount as the list comes to rest and the tap is dropped. On the right, with this PR, the thread opens. The GIF is at half speed (MP4).
The icon flash lasts about one frame, too short to survive the GIF. These are two consecutive frames from the recording before this PR, taken as the list stops. Every project icon is blank, then back. The recording with this PR has no such frame.
Android performance series
These are separate PRs, each reviewable on its own:
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