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LibWeb: Avoid style invalidation when entire document has invalid style
If the entire document is invalidated, we know a full style update is coming soon, and there's no need to try and invalidate a smaller part. This avoids a *lot* of work on some pages. As an example, we are able to skip ~1.5 million style invalidations on https://html.spec.whatwg.org/
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@ -261,6 +261,11 @@ void Node::invalidate_style()
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return;
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}
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// If the document is already marked for a full style update, there's no need to do anything here.
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if (document().needs_full_style_update()) {
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return;
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}
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for_each_in_inclusive_subtree([&](Node& node) {
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node.m_needs_style_update = true;
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if (node.has_children())
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