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script/layout: Ensure a StackingContextTree before IntersectionObserver geometry queries (#38473)

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IntersectionObserver needs to be able to query node geometry without
forcing a layout. A previous layout could have run without needing a
`StackingContextTree`. In that case the layout-less query should finish
building the `StackingContextTree` before doing the query.  Add a new
type of layout API which requests that layout finishes building the
StackingContextTree.

This change also slightly simplifies and corrects the naming of
`Element` APIs around client box queries.

Testing: This should fix intermittent failures in WPT tests.
Fixes: #38380.
Fixes: #38390.
Closes: #38400.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
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Martin Robinson 2025-08-06 15:46:43 +02:00 • committed by GitHub
parent 757dbc0eda
commit 44a11a7c6c
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12 changed files with 78 additions and 59 deletions
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4
components/shared/layout/lib.rs
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@ -241,6 +241,10 @@ pub trait Layout {
/// Requests a reflow.
fn reflow(&mut self, reflow_request: ReflowRequest) -> Option<ReflowResult>;
/// Do not request a reflow, but ensure that any previous reflow completes building a stacking
/// context tree so that it is ready to query the final size of any elements in script.
fn ensure_stacking_context_tree(&self, viewport_details: ViewportDetails);
/// Tells layout that script has added some paint worklet modules.
fn register_paint_worklet_modules(
&mut self,