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CCS corruption when resizing windows

With Mesa 18.1.9, CCS corruption can be easily reproduced by resizing 2 windows at once:

  • win-left to place a firefox window on the left half of the screen
  • win-right to place a firefox window on the right
  • drag center line left/right to resize both windows at the same time.

This reproduces with several applications, including emacs and qt apps. I couldn't get it to repro with nautilus.

Does not reproduce with:

  • Driver "intel"
  • Option "AccelMethod" "none"

https://www.youtube.com/watch?v=QtXpmicG7tM

Also reproduces with XWayland. Jason Ekstrand asked me to write this bug up here.

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