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fix: force auto scroll behavior in virtualized message list navigation

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Removed smooth scroll option to prevent offset issues on unmount
Ensured consistent auto-reconciliation for variable-height rows during scroll
This commit is contained in:
Bohdan Triapitsyn
2026-07-24 20:59:10 +03:00
parent 18b58bdb6b
commit ea157c9aa8
1 changed files with 9 additions and 5 deletions
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packages/ui/src/components/chat/MessageList.tsx
+9 -5
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@@ -1587,7 +1587,7 @@ const MessageList = React.forwardRef<MessageListHandle, MessageListProps>(({
return container.querySelector(`[data-message-id="${messageId}"]`);
}, [resolveScrollContainer]);
const scrollHistoryIndexIntoView = React.useCallback((index: number, behavior: ScrollBehavior = 'auto') => {
const scrollHistoryIndexIntoView = React.useCallback((index: number) => {
if (index < 0 || index >= historyEntries.length) {
return false;
}
@@ -1601,7 +1601,11 @@ const MessageList = React.forwardRef<MessageListHandle, MessageListProps>(({
return false;
}
virtualizer.scrollToIndex(index, { align: 'start', behavior: behavior === 'smooth' ? 'smooth' : 'auto' });
// Smooth scrolling can stop at a stale offset while unmounted,
// variable-height rows replace estimates with real measurements. Use
// exact auto-reconciliation; mounted targets still take the smooth DOM
// path below.
virtualizer.scrollToIndex(index, { align: 'start', behavior: 'auto' });
return true;
}, [historyEntries.length, shouldVirtualizeHistory]);
@@ -1651,7 +1655,7 @@ const MessageList = React.forwardRef<MessageListHandle, MessageListProps>(({
return false;
}
return scrollHistoryIndexIntoView(index, behavior);
return scrollHistoryIndexIntoView(index);
},
scrollToMessageId: (messageId: string, options?: { behavior?: ScrollBehavior }) => {
@@ -1665,7 +1669,7 @@ const MessageList = React.forwardRef<MessageListHandle, MessageListProps>(({
|| (
trailingStreamingEntry !== undefined && index >= historyEntries.length
? false
: scrollHistoryIndexIntoView(index, behavior)
: scrollHistoryIndexIntoView(index)
);
},
@@ -1774,7 +1778,7 @@ const MessageList = React.forwardRef<MessageListHandle, MessageListProps>(({
if (!applyAnchor()) {
const index = messageIndexMap.get(anchor.messageId);
if (typeof index === 'number' && index < historyEntries.length) {
return scrollHistoryIndexIntoView(index, 'auto');
return scrollHistoryIndexIntoView(index);
}
}