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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.
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6 changed files with 142 additions and 16 deletions
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@ -51,6 +51,7 @@ public:
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NonnullRefPtr<StyleProperties> resolve_style(const DOM::Element&, const StyleProperties* parent_style) const;
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Vector<MatchingRule> collect_matching_rules(const DOM::Element&) const;
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void sort_matching_rules(Vector<MatchingRule>&) const;
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static bool is_inherited_property(CSS::PropertyID);
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