Andreas Kling 1ba3ec6ae7 LibWeb: Move part style invalidation into a helper ...

Element.cpp still handled the style invalidation fallout from part and
exportparts attribute changes directly. Move that ::part-related policy
into CSS::Invalidation::PartInvalidator.

Element continues to update the DOM token state for part attributes. The
helper now owns the style dirtiness for elements targeted through ::part
and for shadow-tree descendants exposed through exportparts.

2026-04-29 15:47:23 +02:00

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