1900193 - Non-active window gets blank white until mouse hover

Status: VERIFIED FIXED

(Core :: Widget: Win32, defect)

Description

[kenji]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0

Steps to reproduce:

Open two nightly windows side by side.

Noticed it happening since an update last night.

Actual results:

The inactive window gets blank until some interaction or mouse-hover

Expected results:

Both active and inactive windows displaying correctly

Comment 1

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

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Win32' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Alice0775 White]

STR:

1. Open Nightly and go https://www.mozilla.org/en-US/firefox/nightly/firstrun/
2. Ctrl+N to open new window and go https://www.mozilla.org/en-US/firefox/nightly/firstrun/
3. Focus the second window and place mouse pointer on the second window
4. Wait for 30-60sec
5. Scroll the page on the second window or move the second window

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=21586d01182609c46a64e4ba65cbdb562c579ac0&tochange=6dc11fc546e14a996d36257338f373d6456d6be6

Comment 3

[Alice0775 White]

[Tracking Requested - why for this release]: Poor user experience and flickering windows

Comment 4

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

:nical, since you are the author of the regressor, bug 1716579, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 5

[Cosmin Sabou [:CosminS]]

Should be fixed by this backout: https://hg.mozilla.org/mozilla-central/rev/c76762d7d627d007318879f609107721113d9462

Comment 7

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

The bug is marked as tracked for firefox128 (nightly). We have limited time to fix this, the soft freeze is in 3 days. However, the bug still isn't assigned.

:gcp, could you please find an assignee for this tracked bug? Given that it is a regression and we know the cause, we could also simply backout the regressor. If you disagree with the tracking decision, please talk with the release managers.

For more information, please visit BugBot documentation.

Comment 8

[Catalin Sasca, Desktop Test Engineering [:csasca]]

Reproduced the issue on Firefox 128.0a1 (2024-06-01) on Windows 11 by following the infos provided in Comment 0 and Comment 2.

The issue is fixed on Firefox 128.0b1 and Firefox 129.0a1 (2024-06-11) on the same system.