AnimatedSize: state machine, tests, animate only when needed #11305
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This change make
RenderAnimatedSizea state machine of sorts. When it decides between animating the size or tracking an unstable child it transitions from one state to another. The state dictates what layout logic to apply, when to run the animation controller, as well as what next state to transition to (which may include staying in the same state).Fixes #11307
@Hixie