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core/renderloop: fix subsurfaces vrr scheduling

Błażej Szczygieł requested to merge bms/kwin:fix-vrr-on-subsurfaces-6.3 into Plasma/6.3

We have to take the shortest frame time estimation from all (sub)surfaces to not miss any frame from subsurface.

Also take subsurfaces into account in "RenderLoop::scheduleRepaint()".

Fixes VRR stuttering in QMPlay2 video player.

(cherry picked from commit aef3af5f)

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