Bug 433306

Summary:	Strange walk through windows behaviour
Product:	[Plasma] kwin	Reporter:	Duns <web>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UNMAINTAINED
Severity:	normal	CC:	nate, web
Priority:	NOR
Version First Reported In:	5.21.0
Target Milestone:	---
Platform:	Kubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Duns 2021-02-20 09:06:58 UTC

SUMMARY
I'm not sure after what update this bug is raised, but 3-4 days ago or so.

STEPS TO REPRODUCE
1. Open more than two windows
2. press alt+tab
3. you switch not (always) to the previously highlighted window, but (often) to another window randomly, regardless which window was focused previously

OBSERVED RESULT
a random behavior, without logic: you are moved to a window you don't need to focus on, instead of the one you need.

EXPECTED RESULT
quick switching between the two most important windows I am working on.

SOFTWARE/OS VERSIONSOperating System: KDE neon 5.21
KDE Plasma Version: 5.21.0
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
Kernel Version: 5.4.0-65-generic
OS Type: 64-bit
Graphics Platform: X11
Processors: 4 × AMD Ryzen 3 3200G with Radeon Vega Graphics
Memory: 5,7 GiB of RAM
Graphics Processor: AMD RAVEN

ADDITIONAL INFORMATION

Comment 1 Nate Graham 2021-02-22 23:31:40 UTC

Do any of the windows you don't want to switch to happen to be minimized? If so, heavily related to Bug 427840.

Comment 2 Duns 2021-02-23 16:09:28 UTC

Uhm ... no, I don't think so. This bug is regardless from windows minimization or not.
And it begins only 7/8 days ago or so.

Comment 3 Duns 2021-02-26 08:09:33 UTC

This bug is really annoying: I can't walk anymore with tab+alt, but with the mouse, and many times between librewriter and okular.
Therefore, until you find a way to fix it, couldn't you kindly suggest a temporarily workaround (if possible)?

Comment 4 Nate Graham 2021-02-26 15:57:08 UTC

I can't reproduce the problem, so I have no idea what might be going wrong or how to work around it.

Comment 5 Duns 2021-02-26 16:30:30 UTC

Indeed this strange behavior is not regular, so to say, it's rather something random: it can happen that you have the right behavior many times, but sooner or later it happens that begin the malfunction. 
I noticed because I walk, for my work, always between *two apps*, LibreWriter and Okular, for hours (with other apps open, such as TB or Dolphin, or FF), otherwise, walking in equal measure between many apps, maybe I wouldn't notice it.
But I'm sure that it's something new: before 15 feb 2021 or so, it there wasn't.

Comment 6 David Edmundson 2023-09-06 10:38:12 UTC

This bug was reported against an outdated version of KWin. We have made many changes since the. 
If the issue persists in newer versions can you reopen the bug report updating the version number.