[Merge] lp:~albaguirre/qtubuntu/use-mir-surface-apis into lp:qtubuntu

[Alberto Aguirre]

> 
> """
> QSGGuiThreadRenderLoop::renderWindow
> QSGGuiThreadRenderLoop::exposureChanged
> QQuickWindow::exposeEvent
> QGuiApplicationPrivate::processExposeEvent
> QWindowSystemInterface::handleExposeEvent
> """
> 
> I think that call stack will only happen if event delivery is synchronous
> (synchronousWindowsSystemEvents), which I think (and hope) it's not our case.
> 
> But anyway, if you checked and did see the results you expected than that's
> enough for me. Won't delve into it.

Yeah sorry, it was more of a "logical" call stack. Yeah handleExposeEVent will queue into the event queue. Then the event queue dispatcher will then eventually call QGuiApplicationPrivate::processExposeEvent which will result in a callstack kinda like described above.
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https://code.launchpad.net/~albaguirre/qtubuntu/use-mir-surface-apis/+merge/267228
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