Andreas Kling 4bc3055c0f LibWeb: Only invalidate shadow root when style sheet inside changes ...

We don't have to invalidate style for the entire document when a style
sheet changes inside of a shadow root.

To make this possible, StyleSheetList now keeps track of which
Document-or-ShadowRoot it corresponds to, instead of just tracking the
containing Document.

This avoids a lot of style recomputation on pages with lots of shadow
DOM content (like GitHub).

2024-08-20 16:10:33 +02:00

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