[Bug 1069498]

[Thomas-luebking]

Whatever was the intention of "glWaitVideoSync" (apparently not the way it was utilized in compositors) - "glxinfo | grep GLX_EXT_buffer_age" is void on nvidia 310.19 and as reported in the review request on intel/mesa as well.
So is "grep GLX_EXT_buffer_age /usr/share/doc/nvidia/NVIDIA_Changelog".

That is why we attempt always full repaints and swapping the buffer.
https://git.reviewboard.kde.org/r/107198/

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https://bugs.launchpad.net/bugs/1069498

Title:
  KWin shows tearing despite of VSync

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