Bug 493775

Summary:	Fullscreen application on second monitor covers dragged application windows.
Product:	[Plasma] kwin	Reporter:	jrobin118
Component:	multi-screen	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED INTENTIONAL
Severity:	normal	CC:	kde, nate
Priority:	NOR	Keywords:	multiscreen
Version First Reported In:	6.1.90
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Windowed application covered by fullscreen application on second monitor while dragging and dropped. Elisa staying below full screen application.

Description jrobin118 2024-09-28 11:19:26 UTC

Created attachment 174164 [details]
Windowed application covered by fullscreen application on second monitor while dragging and dropped.

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SUMMARY


STEPS TO REPRODUCE
1. Put application in full screen on second monitor.(Youtube on Firefox flatpak or VLC flatpak)
2.  Drag another window to second monitor over full-screened application. (In attached clip flatpak Elisa is used as example but happens with Dolphin/other applications as well.
3.  Drop windowed window over full-screened application.

OBSERVED RESULT
The full screen application will sometimes cover the windowed application even when windowed application is dropped.

EXPECTED RESULT
The windowed application should remain visible while dragging and dropped over the full-screened application until the full-screen app regains focus.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Fedora Linux 41 Kinoite
KDE Plasma Version: 6.1.90
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.2

ADDITIONAL INFORMATION
Graphics Platform: Wayland
Fedora 41 Kinoite
Processors: 16 x AMD Ryzen 7 3700X 8-Core Processor
Memory: 31.2 GiB RAM
Graphics Processor: AMD Radeon RX 6800 XT

Comment 1 Nate Graham 2024-09-30 18:37:00 UTC

As far as I can see, this is intentional behavior. Can you describe what the problem is with it, exactly?

Comment 2 jrobin118 2024-09-30 19:55:10 UTC

Created attachment 174241 [details]
Elisa staying below full screen application.

Comment 3 jrobin118 2024-09-30 20:43:37 UTC

(In reply to Nate Graham from comment #1)
> As far as I can see, this is intentional behavior. Can you describe what the
> problem is with it, exactly?

I added another video. I am clicking Elisa to focus it, but the top section of Elisa that is on the second monitor, stays below firefox despite Elisa being the focused application. I have to click firefox then back to Elisa for it to appear. If this is intended behavior, I find it quite odd and inconsistent as sometimes Elisa will appear over firefox and sometimes not.

Comment 4 Nate Graham 2024-10-11 19:51:54 UTC

What's going on in that example is that windows on two screens have to be counted as on one screen or another from the perspective of KWin. The way KWin figures this is by computing the percentage of the window on each screen.

So basically, this is intentional behavior. It's not clear how it's actually a real problem; closing.