D21808: [platforms/X11] Disable VSync for QtQuick Windows

ekurzinger added a comment.


  There was mention of switching QtQuick to use SW rendering on PRIME systems, would that be preferable to reverting the tearing fix?
  I just learned that RandR will report a property named "PRIME Synchronization" for any affected outputs, so it should actually be easier than I originally thought to detect. Just need to call XRRListOutputProperies (or whatever the xcb equivalent is).
  I can try to get a quick patch up for review if so.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D21808

To: ekurzinger, #kwin, davidedmundson, zzag
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