Andreas Kling e2e3c7fcdf LibWeb: Rebuild counter style cache lazily ...

Stop rebuilding the counter style cache from every style update.
That made unrelated restyles pay the full counter-style cost even when
no relevant stylesheet state had changed.

Dirty the cache when stylesheet rule caches are invalidated and rebuild
it on the first counter-style lookup instead. Also make cold cache
rebuilds include user stylesheets.

Add regression tests covering insertRule() and replaceSync() updates
that should make newly defined counter styles take effect.

2026-04-05 12:34:28 +02:00

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