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modesetting: Fix random garbage being visible intermittently after a modeset

Michel Dänzer requested to merge daenzer/xserver:modesetting-intermittent-garbage into master

This fundamentally requires two things:

  • Drawing well-defined contents to newly allocated scanout buffers
  • Making sure that drawing has finished before making the buffer visible

Patch 1 prepares for easy backporting of patches 2-4 to the 1.20 branch. Patch 5 cannot be backported.

/cc @ajax @ofourdan

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