Bug 460430

Summary: WindowHeap-based effects + Multimonitor: Dragging and dropping Thunderbird's window between VDs / screens sometimes renders the window off-screen
Product: [Plasma] kwin Reporter: postix <postix>
Component: effects-window-managementAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: normal CC: nate
Priority: NOR    
Version First Reported In: 5.27.2   
Target Milestone: ---   
Platform: openSUSE   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Screenshot: 5.26.0, Thunderbird
kWin Support Info

Description postix 2022-10-14 12:50:19 UTC
Created attachment 152812 [details]
Screenshot: 5.26.0, Thunderbird

STEPS TO REPRODUCE
1. Two screens: 4k@200%, 2k@100%
2.  Open Thunderbird
3.  Open e.g. the desktop grid effect or the present windows effect
4. Drag and drop Thunderbird's window between the VDs (e.g. 4x4 grid)

OBSERVED RESULT
At some point Thunderbird's window disappears in the effect. Only it's highlighting and symbol remains.
Sometimes the upper part window can be found at lower edge of the screen.

I could not observe this, when using a single monitor setup.



SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20221012
KDE Plasma Version: 5.26.0
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6
Kernel Version: 6.0.0-1-default (64-bit)
Graphics Platform: Wayland
Graphics Processor: AMD Radeon RX 580 Series
Comment 1 postix 2022-10-14 12:50:35 UTC
Created attachment 152813 [details]
kWin Support Info
Comment 2 postix 2022-10-14 12:51:35 UTC
I run `MOZ_ENABLE_WAYLAND=1 thunderbird %u`