KCM -> Task Switcher -> Visualization "Show selected window" and "custom effect" (or whatever it's called) is currently a set of mutually-exclusive checkboxes. But if neither is checked, the task switcher is essentially unusable. This should be a set of radio buttons instead, enforcing that one of them is always on. Reproducible: Always
The suggested resolution is wrong since the user might very well want to use a tabbox alongside the highlighting. Unchecking one box may implicitly activate the other if otherwise none was.
Hmm, current task switcher KCM does not have mutually exclusive checkboxes, just checkboxes. I'm unaware of how it was in 2015. Is this still relevant given that now users can set Show selected window on, Custom effect on Show selected window on, Custom effect off Show selected window off, Custom effect on Show selected window off, Custom effect off ?
This bug was reported against an outdated version of KWin.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.