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LibWeb: Only propagate CSS overflow to the viewport once per tree build

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Before this change, we were doing it after every layout, which meant
that already-propagated overflow could be propagated again, which led to
incorrect scrolling behavior.
This commit is contained in:
Andreas Kling 2023-11-02 20:08:02 +01:00
parent bc6f19da0e
commit f9cab320e6
5 changed files with 13 additions and 6 deletions
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7
Userland/Libraries/LibWeb/DOM/Element.cpp
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@ -542,6 +542,13 @@ static Element::RequiredInvalidationAfterStyleChange compute_required_invalidati
return Element::RequiredInvalidationAfterStyleChange::full();
}
// NOTE: If one of the overflow properties change, we rebuild the entire layout tree.
// This ensures that overflow propagation from root/body to viewport happens correctly.
// In the future, we can make this invalidation narrower.
if (property_id == CSS::PropertyID::OverflowX || property_id == CSS::PropertyID::OverflowY) {
return Element::RequiredInvalidationAfterStyleChange::full();
}
// OPTIMIZATION: Special handling for CSS `visibility`:
if (property_id == CSS::PropertyID::Visibility) {
// We don't need to relayout if the visibility changes from visible to hidden or vice versa. Only collapse requires relayout.