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Fix composer toolbar collapse flicker on tab switch (#2937)

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Retained tabs stay mounted under display:none while inactive, which
reports a zero-width onLayout. ControlledAgentControls fed that
straight into its density resolver, so a hidden tab's toolbar
collapsed to its tightest density and painted one frame collapsed
before re-expanding when the tab became visible again.

Extract the zero-width guard that useContainerWidthBelow already had
into a shared readMeasuredWidth helper, and use it in the composer
toolbar's own layout handler so a display:none measurement can never
drive its density.

Also bump the chat outline rail's MIN_PANEL_WIDTH breakpoint (818 ->
918) so the rail disappears earlier under a narrower panel, and widen
the chat-outline e2e spec's viewport so its panel keeps healthy margin
over the new threshold.
This commit is contained in:
Mohamed Boudra
2026-08-06 18:37:38 +08:00
committed by GitHub
parent f2054cc701
commit 2298e9efdf
7 changed files with 179 additions and 6 deletions
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packages/app/src/agent-stream/chat-outline/rail.web.tsx
+1 -1
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@@ -12,7 +12,7 @@ import type { ChatOutlineRailProps } from "./rail";
// magnifying a slot must not move the box the pointer is resting on. See docs/hover.md.
const RAIL_WIDTH = 36;
const SLOT_HEIGHT = 8;
const MIN_PANEL_WIDTH = 818;
const MIN_PANEL_WIDTH = 918;
const RESTING_PILL_HEIGHT = 2;
const MAGNIFIED_PILL_HEIGHT = 4;
const RESTING_PILL_WIDTH = 10;