SUMMARY The titlebar of an application turns into a black box. You can still click the buttons or move it around. I am using the default breeze (light) appearance. STEPS TO REPRODUCE 1. So far I only observed this on Xwayland clients and if it is "raised(?)". The german version says "Fensterheber" - so you can only see its titlebar/window decoration. I do not know what causes it, yet. OBSERVED RESULT The titlebar is rerendered correctly if I resize the window. Not using the maximize or minimize buttons. EXPECTED RESULT Obviously to keep its titlebar intact :) SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE neon (custom kernel 5.4.24) KDE Plasma Version: 5.18.3 KDE Frameworks Version: 5.68.0 Qt Version: 5.14.1
Can you reproduce this bug on X11?
I have been testing wayland for a few weeks to see how stable it got. I started with an empty kde configuration folder. Before that I used X11 for years (and occasional wayland tests) and have never encountered "black boxes". I may check, if I can reproduce it now on X11? But in the past (on neon bionic) it never happened.
There is a way not to get the titlebar black but make it disappear instead. I am Houdini ;) I changed the window title font to something else and the "raised" window titlebar - of Thunderbird/Xwayland in my case - became invisible. If I doubleclick the title bar (to get the window contents back) it is visible again. Sometimes this font changing crash plasmashell and leave the titlebar visible. I can upload a crashdump if you are interested?
Can you still see this behavior. In the past I saw flickering titlebars but not anymore
I haven´t seen it for a long time, too. I guess it´s fixed for XWayland. Native windows don´t support it (yet).
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