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story-kit: fix chat auto-scroll to bottom on new messages (bug 248)

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Correct lastScrollTopRef assignment in scrollToBottom to read back the
browser-capped scrollTop value instead of using scrollHeight, which was
causing handleScroll to incorrectly detect upward scrolling and disable
auto-scroll.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Dave
2026-03-14 19:56:55 +00:00
parent ec652a6fe8
commit 93d5dbd92a
1 changed files with 5 additions and 1 deletions
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6
frontend/src/components/Chat.tsx
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@@ -390,7 +390,11 @@ export function Chat({ projectPath, onCloseProject }: ChatProps) {
const element = scrollContainerRef.current; const element = scrollContainerRef.current;
if (element) { if (element) {
element.scrollTop = element.scrollHeight; element.scrollTop = element.scrollHeight;
lastScrollTopRef.current = element.scrollHeight; // Read scrollTop back after assignment: the browser caps it at
// (scrollHeight - clientHeight), so storing scrollHeight would
// make handleScroll incorrectly interpret the next scroll event
// as an upward scroll and disable auto-scrolling.
lastScrollTopRef.current = element.scrollTop;
} }
}, []); }, []);