Created attachment 156455 [details] Screenshot of a messed-up preview for Firefox STEPS TO REPRODUCE 1. Open Firefox and Thunderbird 2. Play whatever video in mpv, and switch mpv to fullscreen. I don't know why, but in such modes, task switcher doesn't show window previews anymore but only big icons. (I'm btw curious why most applications doesn't shows preview in such situations - and even stranger, GIMP present a pseudo-preview, showing the picture we work on, but not the window itself) 3. Escape full screen or quit mpv. Firefox and sometimes Thunderbird previews will be messed up as visible in the joined screen. When Thunderbird's one is messed up, hovering it in the task switcher fixes the preview. For Firefox, the only way is to switch to the application completely. OBSERVED RESULT Messed-up previews. EXPECTED RESULT Previews shouldn't be messed up. SOFTWARE/OS VERSIONS ArchLinux Linux/KDE Plasma: 5.27.0 (available in About System) I'm not seeing an "About System", where should it be looked for? KDE Plasma Version: KDE Frameworks Version: Qt Version:
Created attachment 156528 [details] Screenshot with both Firefox and Thunderbird Additional screenshot, where we can see that Firefox preview is completely empty while Thunderbird have the window decoration but everything else is empty.