Black stripe on top of window

Hi, bug occurred when I opened one of my recent files. I haven’t worked on anything, I had Blender started and reopened choosing some of my recent projects.

What happened is that black stripe appeared on top of the screen and everything have shifted down but cursor still worked fine.

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Cant reproduce this bug anymore. I had Gimp, mpv and firefox in background. Using Xubuntu and Nvidia drivers. I will update If I manage to reproduce it again.