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View video on youtube.com
Anyone seen it before?
Edit: It's the compositor, unchecking "Allow applications to block compositing" fixes it. It doesn't make sense though, why would a compositor turning off change anything in the actual window list? It shouldn't be tied to the contents of it at all.
I've not seen this error on my PC with KDE Neon, so it's rather difficult for me to tell you what it could be. Do you use the proprietary Nvidia driver? Are there multiple desktops? When did you opened for example Kdenlive the last time before this video ?