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fix(chat): rearm follow after returning to end

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This commit is contained in:
Pascal André
2026-08-27 21:51:10 +02:00
parent 9b2d02c3a7
commit 03a76c9de0
1 changed files with 21 additions and 9 deletions
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packages/ui/src/hooks/useChatTimelineScroll.ts
+21 -9
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@@ -272,6 +272,7 @@ export const useChatTimelineScroll = ({
liveFollowGenerationRef.current = null;
userOwnsScrollRef.current = true;
setUserOwnsScroll(true);
setIsPinned(false);
// The end may already have been left by our own movement, in which
// case no further at-end transition will fire — and while an animated
// follow glide trails the live edge, isAtEndRef is deliberately not
@@ -399,6 +400,10 @@ export const useChatTimelineScroll = ({
if (userGenerationRef.current !== generation || modeRef.current !== 'free-scrolling') return;
const state = listRef.current?.getState();
if (!state || resolveTimelineIsAtEnd(state) !== true) return;
const scrollNode = listRef.current?.getScrollableNode() ?? scrollRef.current;
const atTrueBottom = scrollNode !== null
&& scrollNode.scrollHeight - scrollNode.scrollTop - scrollNode.clientHeight <= AUTO_MATCH_TOLERANCE_PX;
if (!shouldRepinReleasedAutoFollow(lastScrollDirectionDownRef.current, atTrueBottom)) return;
goToBottom('instant');
}, Math.max(0, delayMs));
}, [goToBottom]);
@@ -495,14 +500,15 @@ export const useChatTimelineScroll = ({
&& scrollNode.scrollHeight - scrollNode.scrollTop - scrollNode.clientHeight <= AUTO_MATCH_TOLERANCE_PX;
isAtEndRef.current = true;
setIsPinned(true);
if (!shouldRepinReleasedAutoFollow(lastScrollDirectionDownRef.current, atTrueBottom)) {
clearDelayedRepin();
setIsPinned(false);
hideScrollButton();
queueSave();
return;
}
setIsPinned(false);
if (releasedAt !== null) {
if (!shouldRepinReleasedAutoFollow(lastScrollDirectionDownRef.current, atTrueBottom)) {
clearDelayedRepin();
hideScrollButton();
queueSave();
return;
}
const currentTime = performance.now();
if (shouldDelayAutoFollowRepin(releasedAt, currentTime, REPIN_GRACE_AFTER_RELEASE_MS)) {
scheduleRepinAfterGrace(REPIN_GRACE_AFTER_RELEASE_MS - (currentTime - releasedAt));
@@ -513,6 +519,8 @@ export const useChatTimelineScroll = ({
lastExplicitReleaseAtRef.current = null;
}
clearDelayedRepin();
goToBottom('instant');
return;
}
if (!isAtEnd) clearDelayedRepin();
@@ -533,7 +541,7 @@ export const useChatTimelineScroll = ({
scheduleShowScrollButton();
}
queueSave();
}, [clearDelayedRepin, hideScrollButton, isLiveFollowActive, queueSave, recordScrollDirection, scheduleRepinAfterGrace, scheduleShowScrollButton]);
}, [clearDelayedRepin, goToBottom, hideScrollButton, isLiveFollowActive, queueSave, recordScrollDirection, scheduleRepinAfterGrace, scheduleShowScrollButton]);
// Park the anchored row near the top once the list has measured it.
const onAnchorReady = React.useCallback((messageId: string, anchorIndex: number) => {
@@ -911,6 +919,10 @@ export const useChatTimelineScroll = ({
if (scrollOffset !== previousOffset && scrollOffset <= previousOffset + 0.5) {
clearDelayedRepin();
}
const state = listRef.current?.getState();
if (modeRef.current === 'free-scrolling' && resolveTimelineIsAtEnd(state) === true) {
onIsAtEndChange(true);
}
queueSave();
};
const handleMouseDown = (event: MouseEvent) => {
@@ -946,7 +958,7 @@ export const useChatTimelineScroll = ({
scrollNode.removeEventListener('scroll', handleScroll);
window.removeEventListener('pointerdown', handleOverlayScrollbarPointerDown, true);
};
}, [clearDelayedRepin, queueSave, realContentOverflowsViewport, recordScrollDirection, scrollNode]);
}, [clearDelayedRepin, onIsAtEndChange, queueSave, realContentOverflowsViewport, recordScrollDirection, scrollNode]);
// ── session lifecycle ───────────────────────────────────────────────────
const lastSessionKeyRef = React.useRef<string | null>(null);