1839550 - Rendering artefacts on codepen demo (https://codepen.io/noahblon/pen/DpNRyR?editors=1100)

Status: VERIFIED FIXED

(Core :: Layout, defect)

Description

[Mayank Bansal]

Go to https://codepen.io/noahblon/pen/DpNRyR?editors=1100
Click inside the CSS code-pane
Let the demo run for 15-20 seconds

AR: the demo starts to flash pretty soon. After 5-10 seconds, triangular/rectangular black patches will appear

Regression:
Bug 1831148: Increase clamping range for TransformGfxRectToAncestor. r=emilio

Comment 1

[Mayank Bansal]

Attachment: about:support

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1831148

:dshin, since you are the author of the regressor, bug 1831148, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 3

[Donal Meehan [:dmeehan]]

:dshin has there been any progress on this?
Could this be triaged for Priority/Severity

Comment 4

[David Shin[:dshin]]

Ahhh.. This is effectively bug 1419225.
Going to have to back that out & reopen bug 1831148

Comment 5

[David Shin[:dshin]]

Attachment: Bug 1839550 - Back out increased clamping range. r=#layout-reviewers

Was introduced in bug 1831148, regresses the behaviour fixed by
bug 1419225.

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/e55230080383
Back out increased clamping range. r=dholbert

Comment 7

[Serban Stanca [:SerbanS]]

https://hg.mozilla.org/mozilla-central/rev/e55230080383

Comment 8

[BugBot [:suhaib / :marco/ :calixte]]

The patch landed in nightly and beta is affected.
:dshin, is this bug important enough to require an uplift?

• If yes, please nominate the patch for beta approval.
• If no, please set status-firefox115 to wontfix.

For more information, please visit BugBot documentation.

Comment 9

[David Shin[:dshin]]

Comment on attachment 9341528 [details]
Bug 1839550 - Back out increased clamping range. r=#layout-reviewers

Beta/Release Uplift Approval Request

• User impact if declined: Artefacts on large animated elements with perspective. Real precedent in bug 1419225. Verified no artefacts on today's Nightly.
• Is this code covered by automated tests?: No
• Has the fix been verified in Nightly?: Yes
• Needs manual test from QE?: No
• If yes, steps to reproduce: Bug 1839550 comment 0
• List of other uplifts needed: None
• Risk to taking this patch: Low
• Why is the change risky/not risky? (and alternatives if risky): Backout into previous behaviour that has existed for 5+ years.
• String changes made/needed: -
• Is Android affected?: Yes

Comment 10

[Donal Meehan [:dmeehan]]

Comment on attachment 9341528 [details]
Bug 1839550 - Back out increased clamping range. r=#layout-reviewers

Thanks for the request, 115 is now in RC moving the request to release

Comment 11

[Donal Meehan [:dmeehan]]

Comment on attachment 9341528 [details]
Bug 1839550 - Back out increased clamping range. r=#layout-reviewers

Approved for 115.0 RC2

Comment 12

[Donal Meehan [:dmeehan]]

https://hg.mozilla.org/releases/mozilla-release/rev/a069bcfde555

Comment 13

[Donal Meehan [:dmeehan]]

https://hg.mozilla.org/releases/mozilla-esr115/rev/5775a2856e10

Comment 14

[Peter Magyari (Desktop QA)]

I have managed to reproduce the issue using Firefox Beta 115.b9 (20230622161221) and verified the fix using Firefox Nightly 116.0a1 (20230629214838), Firefox 115.0 RC 2 (20230629134642) and Firefox ESR 115 (20230629151558) on Windows 10, MacOS 11.6 and Ubuntu 20.04.