If a screen edge is set to trigger the window switcher, keep moving the mouse toward the edge quickly shows and hides the switcher, making it hard to trigger it. It seems that each pixel the mouse moves toggles the switcher. Maybe an option would be to only hide the switcher if the mouse has moved away from the edge?
Created attachment 103546 [details] Screencast showing the bug in action
What are your settings for reactivation delay in screen edges? The default is 350 msec and that should prevent what you are seeing.
I can confirm the same issue in Plasma / KWin 5.10.4. The settings for delays are the same as defaults (350ms for reactivation, 150ms for animation). For some reason if the action is to trigger the window switcher, just keep moving the mouse toward the edge and the switcher will be shown / hidden all the time.
Can reproduce also on Wayland I noticed that after edge show windows animation regular cursor transforms into hand and back into regular cursor, and when it transforms back into regular - it slides back for one or more pixels and if continue to move towards the screen edge it - left part of the cursor hides behind the screen edge, it's aspeccialy noticed when moving cursor towards top left corner Operating System: KDE neon Developer Edition KDE Plasma Version: 5.14.80 Qt Version: 5.11.1 KDE Frameworks Version: 5.51.0 Kernel Version: 4.15.0-34-generic OS Type: 64-bit Processors: 8 × Intel® Core™ i5-8250U CPU @ 1.60GHz Memory: 7,7 GiB of RAM
This bug report is quite old. Can you please confirm, that the issue still persists with Plasma 5.23? If so, can you please provide a list of steps, describing how to reproduce the issue. Please also provide information from the screen edges settings, the theme used and the output of qdbus org.kde.KWin /KWin supportInformation
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Sorry for the delay. I can confirm that in Plasma 5.23 (possibly earlier) the window switcher keyboard shortcuts work as expected.