1745845 - Hovering an image with transform:scale(1.03) drastically flickers

Status: NEW

(Core :: Graphics: WebRender, defect, P3)

Description

[Darkspirit (doesn't receive bugmail until AWS SES supports IPv6 DNS)]

Attachment: av1.webm

Gnome Xwayland, Debian Testing, Intel
Screencast: mozregression --launch 2021-12-12 -a https://www.rnd.de/

MOZ_DISABLE_CONTENT_SANDBOX=1 mozregression --good 2020-01-12 --bad 2021-01-12 -a https://www.rnd.de/

17:25.10 INFO: Last good revision: d1114574b777bb00b85f73733a8bd6a78d2ad87e (2020-05-13)
17:25.10 INFO: First bad revision: a77ca5bd6b7c49099c672e103771ca2bf077cc40 (2020-05-14)
17:25.10 INFO: Pushlog:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=d1114574b777bb00b85f73733a8bd6a78d2ad87e&tochange=a77ca5bd6b7c49099c672e103771ca2bf077cc40

Comment 1

[Darkspirit (doesn't receive bugmail until AWS SES supports IPv6 DNS)]

Could this have been caused by bug 1636119, bug 1637801, bug 1637806 or bug 1332588?

Comment 2

[Hiroyuki Ikezoe (:hiro)]

Bug 1636119 is for the old layers backend, bug 1637801 is unrelated, reverting bug 1637801 didn't fix the flicker. I am not sure about bug 1332588 yet, but it looks it's unlikely the cause.

Comment 3

[Hiroyuki Ikezoe (:hiro)]

So, the culprit is https://hg.mozilla.org/mozilla-central/rev/641d8019eb5ec1e8fe994aef4bd3509326e01a45 . I'd say bug 1332588 unwallpapered a pre-existing issue.

Comment 4

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

Set release status flags based on info from the regressing bug 1332588

Comment 5

[Brian Birtles (:birtles)]

Reproduces for me on Windows 10.

Comment 6

[Bob Hood [:bhood]]

Assigning to Hiro since he authored the regressing work.