Since I updated to Thunderbird 91.4 I have a problem with the compose window. If I open a new message with ctrl+n often a random part of the new window stays 100% transparent. I can get the are back by switching to another desktop and back or by minimising and restoring the window. Any idea how this can be solved?
I use KDE on LEAP 15.3
I’ve the same configuration and don’t see this issue.
If you reinstall the previous version 78.3.0 from yast>program manager does the problem goes away?
Anyway, I’d start by checking composition settings, like trying with compositor (desktop effects) on/off, render type, openGL version, etc., see systemsettings>display & monitor>compositor.
TB also has a hardware acceleration option in preferences>general.
Regardless, I think this probably merits a bug report.
Thanks for your help! Switching off hardware acceleration seems to do the job.