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messagelist: follow appended bursts when pinned to bottom in a short buffer

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Jean Chevronnet 2026-07-05 17:59:55 +00:00
parent 6800e6fa45
commit 854c872aea
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1 changed files with 7 additions and 4 deletions
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11
src/components/chat/MessageList.tsx
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@ -219,12 +219,15 @@ export function MessageList() {
const switched = prevActive.current !== active;
prevActive.current = active;
const grew = el.scrollHeight - prevHeight.current;
if (switched) {
if (switched || atBottom.current) {
// Buffer switch, or we were pinned to the bottom → follow the newest line.
// atBottom is checked BEFORE the prepend heuristic on purpose: in a short
// buffer the bottom itself sits at scrollTop < 80, so a burst of appended
// lines (e.g. a /cs HELP reply) must scroll down to them rather than be
// mistaken for a history prepend and leave them hidden under the composer.
el.scrollTop = el.scrollHeight;
} else if (el.scrollTop < 80 && grew > 0) {
el.scrollTop = el.scrollHeight - prevHeight.current; // prepend → keep position
} else if (atBottom.current) {
el.scrollTop = el.scrollHeight;
el.scrollTop = el.scrollHeight - prevHeight.current; // prepend while reading up → keep position
}
prevHeight.current = el.scrollHeight;
}, [count, active, search]);