[hcpp] HCPP platform view not fully clearing when scrolling off screen #175882
Description
See the video. Given that the size of the portion that isn't cleared is dependent on scroll speed, I'd suspect this is because we aren't pushing an update for the final frame where the platform view is gone.
Perhaps we have a bug here?
Do we push updates to the platform view on frames n-m, n-(m-1), ..., n-1, but forget to push updates on frame n when the PV is fully off screen? It sort of looks like that, based on
if (!FrameHasPlatformLayers()) {
frame->Submit();
// If the previous frame had platform views, hide the overlay surface.
HideOverlayLayerIfNeeded();
jni_facade_->applyTransaction();
return;
}Isn't that only maybe hiding the (flutter) overlay on top of the platform view? Not actually sure what frame->Submit(); does.