Bug 457740

Summary:	When screens are arranged to be partially overlapping in KScreen KCM, main screen drawn over part of external monitor
Product:	[Plasma] kwin	Reporter:	piotr.juzwiak
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	minor	CC:	nate
Priority:	NOR
Version First Reported In:	5.25.4
Target Milestone:	---
Platform:	openSUSE
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	5.26
Sentry Crash Report:
Attachments:	Picture of laptop and monitors in tthe background showing overlapping area. Another picture of the issue "Drag and drop" setting used Config before change Config after change

Description piotr.juzwiak 2022-08-10 22:21:05 UTC

Created attachment 151236 [details]
Picture of laptop and monitors in tthe background showing overlapping area.

SUMMARY
***
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***


STEPS TO REPRODUCE
1.  In a multimonitor scenario drag the "main" screen over the external monitors so they overlap
2.  The main screen's area is displayed over the external screen's area
3. 

OBSERVED RESULT

The laptop's area is displayed/rendered on the external monitor(s)

EXPECTED RESULT
I would imagine it shouldn't display/render laptop's "area" on the external monitors

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version:  5.25.4
KDE Frameworks Version: 5.96
Qt Version: 5.15.5

ADDITIONAL INFORMATION
Using amdgpu, connecting to monitors via  USB-C to DP cable.

Comment 1 piotr.juzwiak 2022-08-10 22:21:31 UTC

Created attachment 151237 [details]
Another picture of the issue

Comment 2 piotr.juzwiak 2022-08-10 22:21:59 UTC

Created attachment 151238 [details]
"Drag and drop" setting used

Comment 3 Nate Graham 2022-08-11 18:06:27 UTC

Cannot reproduce on current git master with Wayland. Are you using X11 or Wayland?

Comment 4 piotr.juzwiak 2022-08-11 19:05:53 UTC

HI Graham, I can replicate it in both wayland and X11 enironment. I'm trying to get some better debugging info now

Comment 5 piotr.juzwiak 2022-08-11 20:03:58 UTC

Created attachment 151266 [details]
Config before change

Comment 6 piotr.juzwiak 2022-08-11 20:04:24 UTC

Created attachment 151267 [details]
Config after change

Comment 7 piotr.juzwiak 2022-08-11 20:05:50 UTC

I've added two versions from kscreen folder where I noticed a difference.  I've saved both config files before and after change to compare. Please let me know what kind of other information you'd like me to get.

Comment 8 piotr.juzwiak 2022-08-11 21:01:03 UTC

HI Graham,

I've tested it with the latest Unstable KDE Neon and I couldn't reproduce the same issue (besides having another issue with gpu but unrelated).

Comment 9 Nate Graham 2022-08-11 21:03:24 UTC

Awesome, thanks so much for testing! It would seem that it's already fixed in Plasma 5.26, then.