1815562 - [wpt-sync] Sync PR 38398 - Fix fixed-position visual rect expansion with additional transforms/clips

Status: RESOLVED FIXED

(Core :: Web Painting, task, P4)

Description

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Sync web-platform-tests PR 38398 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/38398
Details from upstream follow.

Xianzhu Wang <[e-mail]> wrote:

Fix fixed-position visual rect expansion with additional transforms/clips

The previous code fails to expand fixed-position visual rect when
there are non-translation transforms or clips that change on scroll.

This CL

• Removes the clip condition before expansion for fixed-position;
• Adjusts state to the scrolling contents space;
• Applies transforms before expanding fixed-position visual rect;
• Ignores clips because they may change on scroll.

MapFixedVisualRectInScrollForCompositingOverlap() replaces the
original ExpandFixedVisualRectInScroller(). It's similar to
MapVisualRectAboveScrollForCompositingOverlap() but is in the reversed
direction and ignores clips.

Bug: 1400107
Change-Id: If3d43084227200dca92cdc0f14e741854fc40979

Reviewed-on: https://chromium-review.googlesource.com/4219881
WPT-Export-Revision: cbc96ab5e584d9eddf3a22c1c8a0549953099c40

Comment 1

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Pushed to try (stability) https://treeherder.mozilla.org/#/jobs?repo=try&revision=63b1edee0da111a3ffe0246095ac93c7488fab5d

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/a558b2049030
[wpt PR 38398] - Fix fixed-position visual rect expansion with additional transforms/clips, a=testonly

Comment 3

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Test result changes from PR not available.

Comment 4

[Natalia Csoregi [:nataliaCs]]

https://hg.mozilla.org/mozilla-central/rev/a558b2049030