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Joshua Gross
5bd5fcdd38
Summary: The current implementation of LayoutAnimations assumed that the "previous/old" ShadowView passed into the diff mutation didn't matter except for purposes of diffing. As it turns out, iOS components could possibly use the "old" version of props, state, etc - so we should try to keep track of the current value in the tree as much as possible. This diff accomplishes that by keeping track of the "previous" view, which the AnimationDriver will update over time. This also allows us to simplify logic around conflicting animations. I'm also adding a few additional asserts to assist in debugging. This doesn't totally eliminate all asserts hit on iOS, yet, but it does reduce the number of times the asserts are hit in StubViewTree. Changelog: [Internal] Reviewed By: sammy-SC Differential Revision: D25048644 fbshipit-source-id: d00aeece5af04624d8193063be453c7ce4a6e565