Jelle Raaijmakers e281e3a274 LibWeb: Move mutation observers from IntrusiveList to GC::RootVector ...

We need to prevent these mutation observers from being garbage
collected, and since they are only part of SimilarOriginWindowAgent and
themselves as part of the intrusive list, nobody is visiting them.

Make the list of pending mutation observers a GC::RootVector so we keep
them alive until they have been processed in the microtask.

Restores 1400+ WPT subtest passes in `dom/nodes/Element-classlist.html`.

2025-11-24 12:45:22 +00:00

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