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4grayandClaude Opus 5.5
d2cb9445da
Opening an Xtream portal from the dashboard inserted the 323 px context panel and the header Back in the frame that swaps the page: the content pane jumped right by the panel's width and the switcher, search and actions by Back's slot. That one frame was J2's whole layout shift (0.2327: 0.222 for the content pane, 0.011 for the header, scored with the pane's distance), plus 0.0001 when the category search and sort buttons appeared with the categories. LayoutSlideDirective animates these moves as a 180 ms FLIP: the new layout applies at once and only a transform animates, so nothing waits and no layout shift is recorded. The content surface covers the strip it uncovers while sliding, Back fades in, and reduced motion keeps the jump. The category search and sort buttons render disabled while the list loads. Locally J2 renderer.layoutShiftScore reads 0 (was 0.233), J1 0 / 0, J3 0.001, J4 0. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>