1868549 - [wpt-sync] Sync PR 43535 - Avoid bad relayout roots inside pagination.

Status: RESOLVED FIXED

(Core :: Layout, task, P4)

Description

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

Sync web-platform-tests PR 43535 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/43535
Details from upstream follow.

Morten Stenshorne <[e-mail]> wrote:

Avoid bad relayout roots inside pagination.

We were already preventing this from happening when inside multicol, but
it turns out that we need it for printing as well.

It is actually (at least currently) possible for the print layout to be
updated after initial layout for pagination but before painting
(printing) it. Accessibility may trigger this via Document::
AddAXContext(), which may be called at such an inconvenient time, and it
may trigger a style recalc, and thus layout. Due to crbug.com/452672, it
may also happen inside a window.matchMedia("print") listener.

Bug: 1507840
Change-Id: I213efc610c2b57fc3beceef99e5c52c8655bc483
Reviewed-on: https://chromium-review.googlesource.com/5093875
WPT-Export-Revision: e54e5aa9cf79f880e808a4711278afb5cc4a7f8a

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=cdfa1a34f4843e866887cf1a1647818e28a2915a

Comment 2

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

CI Results

Ran 0 Firefox configurations based on mozilla-central, and Firefox, Chrome, and Safari on GitHub CI

Total 1 tests

Status Summary

Firefox

PASS: 1

Chrome

PASS: 1

Safari

PASS: 1

Links

GitHub PR Head
GitHub PR Base

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/92094b790da6
[wpt PR 43535] - Avoid bad relayout roots inside pagination., a=testonly

Comment 4

[Noemi Erli[:noemi_erli]]

https://hg.mozilla.org/mozilla-central/rev/92094b790da6