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layout: Account for transform in scrollable overflow (#36138)

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In the scrollable overflow calcutation, apply CSS transforms to boxes
and scrollable overflow of the descendant. Clip unreachable scrollable
overflow according to it's block start and inline start scrolling
direction. And, renamed `Fragment::scrolling_overflow` to
`Fragment::scrolling_overflow_for_parent` as it was calculating the
scrolling overflow contribution from a child.

Add several WPT tests, testing the transform interaction `rotate`,
`scale`, and `skew` with scrollable overflow. There are several WPT test
that are testing the interaction that not expected from current browsers
implementation according to the spec.

Testing: Existing and new WPT. 
Fixes: #36031

---------

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>
This commit is contained in:
Steven Novaryo 2025-04-29 17:37:27 +08:00 • committed by GitHub
parent b92542b756
commit bd6928f3dc
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37 changed files with 974 additions and 288 deletions
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components/layout/flow/root.rs
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@ -411,7 +411,7 @@ impl BoxTree {
let scrollable_overflow = root_fragments
.iter()
.fold(PhysicalRect::zero(), |acc, child| {
let child_overflow = child.scrollable_overflow();
let child_overflow = child.scrollable_overflow_for_parent();
// https://drafts.csswg.org/css-overflow/#scrolling-direction
// We want to clip scrollable overflow on box-start and inline-start