Keep non-layout animations on the synchronous path while another view animates layout - #58772
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… animates layout Summary: The shared animation backend decided per surface whether a frame's animated props go through a shadow tree commit or straight to the mounted views. As soon as one view animated a layout prop, every animated view on that surface went through the commit path for the whole animation, including views that only animate `transform` or `opacity`. Besides the extra commit work, on Android this moved those views from `updatePropsSynchronously` to regular mounts. There the synchronous mount props cache (`overrideBySynchronousMountPropsAtMountingAndroid`) replaced the incoming transform with its last synchronously written value, so the view froze while the other view's layout animation ran and jumped when it ended. The decision is now made per view. `SurfaceUpdates` holds a surface's mutations keyed by view tag, and `applySurfaceUpdates` splits them into views with layout updates, which go through `commitUpdates`, and the rest, which are applied synchronously. `AnimationMutation` and `AnimationMutations` move to `AnimationMutation.h`, still included by `AnimationBackend.h`. `AnimatedPropsRegistry::update` reads the frame's batches instead of the merged per-surface map. ## Changelog: [General] [Fixed] - A view animating only non-layout props on the shared animation backend no longer freezes while another view on the surface animates a layout prop Differential Revision: D122570616
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Summary:
The shared animation backend decided per surface whether a frame's animated props go through a shadow tree commit or straight to the mounted views. As soon as one view animated a layout prop, every animated view on that surface went through the commit path for the whole animation, including views that only animate
transformoropacity. Besides the extra commit work, on Android this moved those views fromupdatePropsSynchronouslyto regular mounts. There the synchronous mount props cache (overrideBySynchronousMountPropsAtMountingAndroid) replaced the incoming transform with its last synchronously written value, so the view froze while the other view's layout animation ran and jumped when it ended.The decision is now made per view.
SurfaceUpdatesholds a surface's mutations keyed by view tag, andapplySurfaceUpdatessplits them into views with layout updates, which go throughcommitUpdates, and the rest, which are applied synchronously.AnimationMutationandAnimationMutationsmove toAnimationMutation.h, still included byAnimationBackend.h.AnimatedPropsRegistry::updatereads the frame's batches instead of the merged per-surface map.Changelog:
[General] [Fixed] - A view animating only non-layout props on the shared animation backend no longer freezes while another view on the surface animates a layout prop
Differential Revision: D122570616