Andreas Kling 89e5deb7b9 LibWeb: Centralize style scope lookup for invalidation ...

Several invalidation paths need to consider not only a node's own root
scope, but also shadow scopes that can observe the node through :host(),
::slotted(), or ::part() selectors. Each caller open-coded that
traversal, which made the dir/lang and dir=auto fixes carry the same
shadow-boundary logic in multiple places.

Add Node helpers for resolving a node's style scope and for visiting
every style scope that may observe that node. Use them from the
property, child-list, dir/lang, and dir=auto invalidation paths, and
share the same style-scope lookup with DOM::AbstractElement and
Layout::NodeWithStyle.

2026-04-26 10:40:58 +02:00

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