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present: Check that flip and screen pixmap pitches match

Michel Dänzer requested to merge daenzer/xf86-video-amdgpu:present_check_flip-pitch into master

If they don't, flipping will result in corrupted display.

Test case:

  • Run Xorg at 1920x1080 with no window manager
  • glxgears -geometry 2048x1080

The Present extension code in xserver 1.21 will check for this.

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