SUMMARY The titelbar disappears when certain things happens. It is recoverable but inconvenient. STEPS TO REPRODUCE 1. Log into the desktop, picking Plasma(Wayland) 2. Change your window decorations to Plastik (System-Settings-> Appearance -> Window Decorations -> Plastik) 3. Start a program. For this example open Dolphin (graphical file manager). 4. Maximize the window. (Click on upper right button, just left of the X button) 5. Completely close the program. (Click the upper X) 6. Start the program. OBSERVED RESULT The window comes up maximized, but the top titlebar is gone. EXPECTED RESULT The window comes up maximized, but the top titlebar is there. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Fedora 34 KDE Plasma Version: 5.22.4 KDE Frameworks Version: 5.83.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION This doesn't happen in X11. This doesn't happen with the breeze window decorations. It was originally observed in plasma/kwin 5.21.3. I've been able to reproduce this in a fresh KDE install, as well as starting with a fedora workstation (with gnome installed) and then installing KDE Plasma Dekstop.
Created attachment 140643 [details] Proper titlebar
Created attachment 140644 [details] Titlebar missing
Is it invisible but still interactive or just gone? If it's gone, does this mean that clicks in the area where it should be actually get passed down to whatever is underneath the titlebar-less window?
It is fairly interactive. You can right click on it, and get the normal right click selections. If I click around I can eventually hit some buttons, but they seems to be out of place. But it does seem to be "invisible" versus "gone".
Interesting, thanks.
This bug was reported against an outdated version of KWin.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.