Linus Groh 5e7945e26f LibWeb: Add a simple StyleInvalidator class ...

This patch adds a simple, naive & inefficient class for document-wide
style invalidation, e.g. after element attribute updates. During
construction it collects a HashMap of a document's elements and their
matching rules, during destruction it does the same and then compares
the results; dirtying all elements that have a different number or order
of matching rules afterwards.

Much room for improvement, but it solves the problem of stale element
styling after attribute updates for now :^)

Fixes #4404.

2020-12-14 23:38:08 +01:00

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