D18366: Fix flickering with Qt 5.12

davidedmundson added a comment.


  > Also relevant is of course Fredrik's comment in the Qt bug report
  
  Volkov has since posted some comments there which I think clarifies the state. 
  Looks pretty sensible.
  
  > Maybe we shouldn't rely on Qt doing that for us, but just do it ourselves.
  
  It seems we technically could, but if we're backporting it to LTS it seems safer to use the existing path that we know worked.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D18366

To: volkov, #kwin
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