https://bugs.kde.org/show_bug.cgi?id=452770
Bug ID: 452770
Summary: Regression: Firefox & Thunderbird pop-up windows
frequently missing contents
Product: kwin
Version: 5.24.4
Platform: Neon Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: s_chriscoll...@hotmail.com
Target Milestone: ---
Created attachment 148245
--> https://bugs.kde.org/attachment.cgi?id=148245&action=edit
video showing the bug
Pop-up windows in both Firefox and Thunderbird will often appear empty. This
can most easily be reproduced by selecting Help -> About Firefox/Thunderbird
from each application's hamburger menu (see attached video). You may have to
try this a few times to get the failure. This bug started happening after a
recent KDE stuff update and is reproducible on both of my computers running KDE
neon, detailed below. I have not, however, been able to reproduce the issue
within VirtualBox.
Once a window appears blank, it will remain so until the window is
minimized/restored, or in cases where the window features a button or other
interactive widget, moving the cursor over the widget can cause the window to
be properly drawn.
Switching to the "Plastik" decoration solves the issue. Adjusting various
settings within the Breeze window decoration (borders, shadow, gradient, etc.)
had no effect. Also, this does not appear to be a compositing issue, as the bug
persists with compositing disabled.
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