It happens or happened especially on older Intel cards that are integrated. When you e.g. watch a movie then you see screen artifacts when there are fast movements. One has to see it and then you will immediately understand what it is.
Though it can be easily fixed with the recent Xfce releases. I posted a fix for Tumbleweed that can be used on any other distro. But not all machines are equally affected and the default Xfce 4.16 setting in xfwm4 (Xfce’s window manager) should work for most cards.
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