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LibWeb: Skip invalidating :first-child and :last-child if possible

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There is no need to invalidate siblings affected by these pseudo classes
if invalidation reason is not insertion or removal of tree nodes.
This commit is contained in:
Aliaksandr Kalenik 2025-03-09 16:38:34 +01:00 committed by Alexander Kalenik
parent 0e057d3a36
commit 92a3419799
1 changed files with 10 additions and 2 deletions
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12
Libraries/LibWeb/DOM/Node.cpp
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@ -461,8 +461,16 @@ void Node::invalidate_style(StyleInvalidationReason reason)
}
for (auto* sibling = next_sibling(); sibling; sibling = sibling->next_sibling()) {
if (auto* element = as_if<Element>(sibling); element && element->style_affected_by_structural_changes())
element->set_entire_subtree_needs_style_update(true);
if (auto* element = as_if<Element>(sibling)) {
bool needs_to_invalidate = false;
if (reason == StyleInvalidationReason::NodeInsertBefore || reason == StyleInvalidationReason::NodeRemove) {
needs_to_invalidate = element->style_affected_by_structural_changes();
} else {
needs_to_invalidate = element->affected_by_sibling_combinator() || element->affected_by_nth_child_pseudo_class();
}
if (needs_to_invalidate)
element->set_entire_subtree_needs_style_update(true);
}
}
for (auto* ancestor = parent_or_shadow_host(); ancestor; ancestor = ancestor->parent_or_shadow_host())