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.
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.
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.