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layout: Store most anonymous pseudo-elements in box slots (#37941)

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Previously, anonymous boxes, such for anonymous table parts were not
associated with their non-pseudo ancestor DOM nodes. This presents a
problem when it comes time to clear layout data during incremental
layouts. This change reworks the way that pseudo-elements in general are
stored in their non-pseudo ancestor DOM nodes, allowing for any number
to be placed there.

This trades a bit of performance for space, as just adding a vector to
the node would add something like 24 bytes of storage to every node.
This change should have a neutral runtime memory usage.

Testing: This shouldn't change observable behavior and is thus covered
by
existing WPT tests. It will allow tests to pass in a subsequent PR.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Martin Robinson 2025-07-08 17:22:09 +02:00 • committed by GitHub
parent 4054f9a5a0
commit 51367c22a6
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7 changed files with 106 additions and 95 deletions
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5
components/layout/flow/root.rs
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@ -302,10 +302,7 @@ impl<'dom> IncrementalBoxTreeUpdate<'dom> {
}
let layout_data = NodeExt::layout_data(&potential_dirty_root_node)?;
if layout_data.pseudo_before_box.borrow().is_some() {
return None;
}
if layout_data.pseudo_after_box.borrow().is_some() {
if !layout_data.pseudo_boxes.is_empty() {
return None;
}