Andreas Kling 029b4998e5 LibWeb: Skip useless sibling scans in generic :has() walks ...

Track whether any :has() relative selector in a style scope uses a
sibling combinator and let the generic ancestor walk consult that
before scanning ancestor siblings.

This keeps descendant-only :has() invalidations from walking unrelated
siblings while preserving the existing behavior for selectors that use
+ or ~. Add counter-based test coverage so the reduced sibling scans
stay visible through the invalidation counters.

2026-04-20 13:20:41 +02:00

5.2 KiB

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