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fix: auto scroll not working for the final assistant message #8578

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Merged
AdityaHegde merged 2 commits into from
Jan 14, 2026
Merged

fix: auto scroll not working for the final assistant message #8578

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61a882b
fix: auto scroll not working for the final assistant message
AdityaHegde Dec 30, 2025
c703566
tweaks
AdityaHegde Jan 14, 2026
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16 changes: 11 additions & 5 deletions web-common/src/features/chat/core/messages/Messages.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -46,8 +46,10 @@
$: isConversationEmpty =
($getConversationQuery.data?.messages?.length ?? 0) === 0;

// Track previous block count to detect new content
// Track previous block count to detect new content and previous block type to detect block changing.
// This is used to determine whether to scroll to bottom of messages container or not.
let previousBlockCount = 0;
let previousBlockType = "";

// Check if user is near the bottom of a scroll container
function isNearBottom(element: Element, threshold = 100): boolean {
Expand All @@ -60,20 +62,24 @@
}

// Auto-scroll behavior:
// - Always scroll when new blocks are added (new message sent or response started)
// - Always scroll when new blocks are added or if the last block changes (new message sent or response started)
// - Only scroll during streaming if user is near the bottom (respect scroll position)
afterUpdate(() => {
const currentBlockCount = blocks.length;
const hasNewBlocks = currentBlockCount > previousBlockCount;
const currentBlockType = blocks[currentBlockCount - 1]?.type ?? "";
const hasBlockChanged =
currentBlockCount > previousBlockCount ||
currentBlockType !== previousBlockType;
previousBlockCount = currentBlockCount;
previousBlockType = currentBlockType;

if (messagesContainer && layout === "sidebar") {
if (hasNewBlocks || isNearBottom(messagesContainer)) {
if (hasBlockChanged || isNearBottom(messagesContainer)) {
scrollToBottom(messagesContainer);
}
} else if (layout === "fullpage") {
const parentWrapper = messagesContainer.closest(".chat-messages-wrapper");
if (parentWrapper && (hasNewBlocks || isNearBottom(parentWrapper))) {
if (parentWrapper && (hasBlockChanged || isNearBottom(parentWrapper))) {
scrollToBottom(parentWrapper);
}
}
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