1827927 - [wpt-sync] Sync PR 39525 - Pre-paint: Match OOF layout behavior inside clipped containers.

Status: RESOLVED FIXED

(Core :: Layout, task, P4)

Description

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

Sync web-platform-tests PR 39525 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/39525
Details from upstream follow.

Morten Stenshorne <[e-mail]> wrote:

Pre-paint: Match OOF layout behavior inside clipped containers.

An OOF fragment is normally a direct child of a fragmentainer - unless
it's inside something monolithic. However, we need to check if this is
something truly monolithic, and not just a fragment that was set as
monolithic because we reached the end of a clipped container; see
NGConstrinatSpace::DisableFurtherFragmentation().

Otherwise we'd end up in PrePaintTreeWalk::WalkMissedChildren()
needlessly, and ignore any clipping.

Bug: 1432946
Change-Id: I24fc774f40bf337419f7e6ec336101e00a856f8a
Reviewed-on: https://chromium-review.googlesource.com/4422851
WPT-Export-Revision: bf05d47b747d72aaf45f6cae196a1e05339d1f70

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=ba9547da76f2b0f1877851dc7342ea7e7b9fdcf6

Comment 2

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

CI Results

Ran 9 Firefox configurations based on mozilla-central, and Firefox, Chrome, and Safari on GitHub CI

Total 3 tests

Status Summary

Firefox

PASS: 3

Chrome

FAIL: 3

Safari

PASS: 3

Links

Gecko CI (Treeherder)
GitHub PR Head
GitHub PR Base

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/50c19c23a196
[wpt PR 39525] - Pre-paint: Match OOF layout behavior inside clipped containers., a=testonly

Comment 4

[Iulian Moraru]

https://hg.mozilla.org/mozilla-central/rev/50c19c23a196