fix(web-ui): snap chat to bottom instantly on pane tab re-activation - #565
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August 17, 2026 18:04
Dockview hides inactive tab panels with display:none, so a re-shown pane loses its scroll position and the ResizeObserver-triggered redraw catches up through the smooth-scroll path (.chat-scroll has scroll-behavior: smooth), visibly animating to the bottom. Re-activating an already-loaded pane now resyncs density (a hidden pane measured 0x0) and redraws with forceScroll, which snaps with scroll-behavior:auto.
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Problem
Switching back to a chat tab in a split layout animates a smooth scroll from the top to the bottom of the transcript instead of opening already at the bottom.
Root cause
dockview hides inactive tab panels with
display:none. A re-shown pane has lost its scroll position; the ResizeObserver-driven redraw then catches up through.chat-scroll'sscroll-behavior: smooth, producing the animated scroll. A hidden pane also measures 0x0, leaving density at 'strip', so density must be resynced before the forced redraw or the snap is skipped.Fix
On
onDidVisibilityChange, redraw already-loaded panes withforceScroll: true(after resyncing density), which snaps viascroll-behavior: auto. First show still loads as before.Tests
test/tab-switch-scroll-snap.test.tscovering the forced redraw ordering and the auto-behavior snap path.split-canvas-entry.test.tsto the new handler shape.