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Vance IngallsandClaude Opus 4.8
082280e8de
Extend the rule beyond positional layout props to the text-reflow props letterSpacing / wordSpacing / fontSize. Animating them reflows text and snaps glyph positions to the pixel grid, so a slow ease-out tail micro-stutters exactly like left/top — measured on a real composition, a slow letterSpacing "settle" rendered 19/30 unique frames vs 30/30 for the transform-driven motion in the same piece. They have no transform replacement (fix: settle via scale or hold the value), and the snap happens during browser layout, upstream of the canvas raster, so they are never html-in-canvas-exempt. width/height stay excluded (legit animated uses — progress bars, reveals). Restructure the finding's message/fixHint to compose per category (positional -> x/y; reflow -> scale/hold; roundProps -> remove) instead of a two-branch ternary. Skill guidance (gsap-transforms-and-perf.md) broadened: "layout property" includes reflow; letterSpacing/fontSize named as the settle-trap. Migrate the one surfaced positive: registry/components/vignette/demo.html title settle letterSpacing -> a subtle scale settle (render-verified 20/20 unique frames, smooth). Blast radius across the registry was this one comp, zero false positives. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>