Well, it just happened again, and I realised that the past two times it has happened has always been when <alt>-tabbing. So I decided to restart kwin and, sure enough, everything works. That's the problem.
Well, it just happened again, and I realised that the past two times it has happened has always been when <alt>-tabbing. So I decided to restart kwin and, sure enough, everything works. That's the problem.
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