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layout: Fix scrollParent to skip ancestors with display: contents (#39153)

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When encountering such an ancestor, we were returning null instead of
skipping it.

Testing: Adding new subtest for this. And while I'm at it, another one
for the root element, unrelated to this fix.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
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Oriol Brufau 2025-09-05 16:49:21 +02:00 • committed by GitHub
parent cf1f64e73f
commit 0f9f507b46
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3 changed files with 14 additions and 4 deletions
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7
components/layout/query.rs
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@ -701,10 +701,13 @@ pub(crate) fn process_scroll_parent_query(
continue;
};
let (ancestor_style, ancestor_flags) = ancestor_layout_box
let Some((ancestor_style, ancestor_flags)) = ancestor_layout_box
.with_base_flat(|base| vec![(base.style.clone(), base.base_fragment_info.flags)])
.first()
.cloned()?;
.cloned()
else {
continue;
};
let is_containing_block = match current_position_value {
Position::Static | Position::Relative | Position::Sticky => {