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fix: preserve scroll position in session viewer when scrolled up #28

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Merged
wesbillman merged 2 commits into from
Feb 11, 2026
Merged

fix: preserve scroll position in session viewer when scrolled up #28

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891bb80
fix: preserve scroll position in session viewer when scrolled up
baxen Feb 11, 2026
90e5b88
refactor: replace pixel-threshold scroll detection with intent tracking
baxen Feb 11, 2026
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35 changes: 32 additions & 3 deletions staged/src/lib/SessionModal.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -135,7 +135,7 @@
const msgs = await getSessionMessages(sessionId);
if (msgs.length > 0) {
messages = msgs;
scrollToBottom();
scrollToBottomIfNear();
}
} else {
const lastId = messages[messages.length - 1].id;
Expand All @@ -144,7 +144,7 @@
const prev = messages.slice(0, -1);
messages = [...prev, ...updated];
if (updated.length > 1 || updated[0].id !== lastId) {
scrollToBottom();
scrollToBottomIfNear();
}
}
}
Expand Down Expand Up @@ -286,14 +286,43 @@
// Helpers
// =========================================================================

/** Whether the user has intentionally scrolled up (disables auto-scroll). */
let userScrolledUp = $state(false);
let lastScrollTop = 0;

function handleScroll() {
if (!messagesEl) return;
const { scrollTop, scrollHeight, clientHeight } = messagesEl;
const atBottom = scrollHeight - scrollTop - clientHeight < 1;

if (scrollTop < lastScrollTop && !atBottom) {
// Scroll position moved upward — user scrolled up (any input method)
userScrolledUp = true;
}
if (atBottom) {
// They're back at bottom — re-enable auto-scroll
userScrolledUp = false;
}
lastScrollTop = scrollTop;
}

/** Scroll to bottom unconditionally (e.g. initial load, user sends message). */
function scrollToBottom() {
tick().then(() => {
if (messagesEl) {
messagesEl.scrollTop = messagesEl.scrollHeight;
userScrolledUp = false;
}
});
}

/** Scroll to bottom only if the user hasn't intentionally scrolled up. */
function scrollToBottomIfNear() {
if (!userScrolledUp) {
scrollToBottom();
}
}

function renderMarkdown(content: string): string {
return sanitize(marked.parse(content) as string);
}
Expand Down Expand Up @@ -501,7 +530,7 @@
</header>

<!-- Messages area -->
<div class="modal-content" bind:this={messagesEl}>
<div class="modal-content" bind:this={messagesEl} onscroll={handleScroll}>
{#if loading}
<div class="center-state">
<Loader2 size={24} class="spinning" />
Expand Down