[OS X] Tearing when we have animations on top

[Ivshti]

I have the following situation, which I've tested only on OS X and I assume is platform-specific:

QmlVlc is overlayed by a QtWebEngine (a-la-webchimera-desktop)
when animations are triggered in the webengine, I get tearing (few times) on the frames. The more lengthy the animation, the more tearing there is.

What I assume is happening: animations trigger a redraw on the background element, which in turn catches the QmlVlc out-of-sync on a texture/buffer that is part one frame, part another.

I also assume this can be worked around by using a double (triple?) buffer. Maybe something is not right here:
8c8832d ?

Maybe on a forced redraw, you need to always pick the last frame which is not currently modified from the pool?

[RSATom]

Thanks, I'll look.