I opened Kate to paste some text. It put up a message about saving existing
files or data (the message is gone now of course) and when I declined to save
it, the desktop shut down, the system shutdown sequence started, and my
machine powered off.
I'm not sure what logs might have pertinent information about this.
Leslie
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Platform: Linux
Distribution: openSUSE Leap 15.6 - x86_64
Desktop Environment: Trinity
Qt: 3.5.0
TDE: R14.1.2
tde-config: 1.0