[Bug 1069498]

[Ralf Jung]

(In reply to comment #66)
> I think following Weston's approach is probably the best one as I assume
> that 
> Kristian knows what is best with Mesa's drivers.
I will open a review request later today.

> We should know the actual damage area after the effects have modified it,
> once 
> it goes back into the scene. So it should be possible to keep a queue of the 
> last frames damage areas.
I think I found the right spot in paintSimpleScreen. If not, you'll probably complain during review ;-)

> Btw. we have quite some time to get it right as I think that's already too 
> late for 4.10 (we are past soft feature freeze).
So you think this is a feature? That's not for me to decide, of course.
Do you think a simpler patch which just fixes tearing for full-screen repaints could still go into 4.10? Something similar to Thomas' first patch (https://git.reviewboard.kde.org/r/106833/).

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

Title:
  KWin shows tearing despite of VSync

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