Andreas Kling 97e2b05004 LibWeb: Merge equivalent style invalidation plans ...

Compare invalidation sets, rules, and plans structurally so repeated
descendant and sibling invalidation entries can be merged even when
they were built as separate payload objects.

Also deduplicate pending and active descendant invalidations in the
style invalidator so equivalent rules are not re-applied as the DOM
walk descends. This reduces :has() invalidation fanout while keeping
behavior the same.

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

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