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feat: Do not lock scroll position while text is streaming #1096

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feat: Do not lock scroll position while text is streaming #1096

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feat: Do not lock scroll position while text is streaming
AshhKetchup Mar 21, 2026
c40d1af
Update .gitignore
AshhKetchup Mar 22, 2026
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10 changes: 9 additions & 1 deletion apps/app/src/app/pages/session.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -351,6 +351,7 @@ export default function SessionView(props: SessionViewProps) {
let pendingScrollBehavior: ScrollBehavior = "auto";
let lastAutoScrollAt = 0;
let lastKnownScrollTop = 0;
let userScrolledAwayAt = 0;
let streamRenderBatchTimer: number | undefined;
let streamRenderBatchQueuedAt = 0;
let streamRenderBatchReschedules = 0;
Expand Down Expand Up @@ -2292,6 +2293,9 @@ export default function SessionView(props: SessionViewProps) {
runProgressSignature();
if (initialAnchorPending()) return;
if (!isViewingLatest()) return;
// Suppress auto-scroll for 800ms after user scrolled away to prevent fighting manual scroll
const timeSinceUserScroll = Date.now() - userScrolledAwayAt;
if (timeSinceUserScroll < 800) return;
scheduleScrollToLatest("auto");
});

Expand Down Expand Up @@ -4224,10 +4228,14 @@ export default function SessionView(props: SessionViewProps) {
const bottomGap =
container.scrollHeight -
(container.scrollTop + container.clientHeight);
if (bottomGap <= 96) {
// Use a small threshold (24px) to only pin when truly at bottom
// This prevents auto-scroll from fighting manual scroll during streaming
if (bottomGap <= 24) {
setIsViewingLatest(true);
} else if (container.scrollTop < lastKnownScrollTop - 1) {
// User scrolled up - respect their intent
setIsViewingLatest(false);
userScrolledAwayAt = Date.now();
}
lastKnownScrollTop = container.scrollTop;
refreshTopClippedMessage();
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