Simple animation driver constantly repaints every window

The simple animation driver, enabled with QSG_USE_SIMPLE_ANIMATION_DRIVER=1, causes repaints of every surface when any surface needs to animate. This is important because the normal animation driver cannot be used when working with multiple windows, or animations will be extremely glitchy and visually unappealing.

I found this issue due to my GPU overheating and crashing my laptop, from opening the popup with a frameanimation shown in the attached usecase.mp4, where 5 windows (some not pictured) are refreshing far more often than they need to.

You can test this yourself with the attached animdriver.qml (shown in demo.mp4).

$ QSG_USE_SIMPLE_ANIMATION_DRIVER=1 QSG_VISUALIZE=batches qml animdriver.qml

QSG_VISUALIZE=changes shows only the expected area changing, both in the demo and my full use case.