Skip invalidation for identical ARIA and data attributes #554

Parent: #243. CSS epic: #235.

Proven hot path

Pinned unchanged Code OSS virtual-list row refresh rewrites stable data-index, data-last-element, data-parity, aria-setsize, and aria-posinset values from four update/render paths. WebScene currently mutates and schedules selector invalidation/publication for exact present same-value metadata.

Scope

For exact present same-value data-* and aria-* writes only, preserve feature accounting and custom-element attribute reactions, then return before attribute mutation, selector invalidation and dirty publication. Do not generalize to side-effectful attributes such as src, canvas dimensions or form state.

Acceptance

• Focused source and regression authored.
• git diff --check passes.
• 4,096 connected and 4,096 detached metadata rewrites preserve all reactions/reflection/selector styling with zero transition requests/layout/publications.
• Reconnect requires one bounded layout/publication.
• Dynamic Code OSS A/B/ABBA, browser/package, lifecycle, memory, pixel and physical-performance gates run later.

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