Bug 462063

Summary:	Task manager flickers
Product:	[Plasma] kwin	Reporter:	Peter Tselios <ptselios>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	REPORTED ---
Severity:	normal	CC:	nate
Priority:	NOR
Version First Reported In:	5.25.5
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Peter Tselios 2022-11-20 15:24:18 UTC

SUMMARY
***
I have to admit that I haven't pin-point the root cause of this. 
It happens completely randomly but it's quite often. The only solution I have found so far is to restart the PC. 
***

What is happening: 
Icons in the task manager flicker between the active and the previously active window. 

It starts randomly. I thought it was caused by Chrome, but then I realized that is happening with Firefox as well. Also, some times it stops, when I select an application (either via the Alt-Tab, or via the Task Manager). 

I am suspecting a few things but I would prefer to explorer some options as well as a strategy to identify the possible root cause with someone what knows better the underline technology. 

STEPS TO REPRODUCE
1. No idea. I have no idea how it started or how to re-produce it, or why it stops or how it stops!

OBSERVED RESULT
Please check this short video: https://vimeo.com/manage/videos/773024690

EXPECTED RESULT
Task Manager should only show the active window. 

ADDITIONAL INFORMATION
Task manager is configured as follows: 

Show Tooltips
Highlight windows when hovering over task tooltips
Mark Applications that play audio
2 rows max
Group by program Name
Cycles through tasks 
Combine into a single button
Group only when the task manager is full 
Short: Manually
Keep launchers separate
Minimizes on click, 
Open a new window with middle click
Show only tasks from current Activity
Unhide when Window wants attention 
New to the right.

Comment 1 Bug Janitor Service 2022-11-20 15:33:30 UTC

Thank you for the bug report!

Please note that Plasma 5.25.5 is not supported for much longer by KDE; supported versions are 5.24, and 5.26 or newer.

If at all possible please upgrade to a supported version and verify that the bug is still happening there.

If you're unsure how to do this, contact your distributor about it.

Comment 2 Peter Tselios 2022-12-05 08:01:53 UTC

I will keep this report open, although in 5.26 is no flickering is visible in the task bar area, however, I experience some kind of flickering with Kate for example.