Code review comment for lp:~lukas-kde/unity8/occlusion-transparency

> surfaceItem.opacity === 1.0
>
> This is the MirSurfaceItem/QQuickItem::opacity property you're reading, which
> is a renderer-only hint.
>
> MirSurfaceItem will expose a boolean "surfaceOpaque" property that will
> actually tell you if the frame the client draws uses transparency or not.

Ok, that's indeed more correct; let's wait for that