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Summary: The snapToOffsets changes improved the flinging algorithm for snapToInterval/snapToOffsets but actually broke it for pagingEnabled because it's meant to only scroll one page at a time. First, I just brough back the old algorithm, but noticed that it has a bunch of issues (e.g. #20155). So, I tried to improve the algorithm to make sure it uses the proper target offset prediction using the same physics model that Android uses for it's normal scrolling but still be limited to one page scrolls. This resolves #21116. Reviewed By: shergin Differential Revision: D9945017 fbshipit-source-id: be7d4dfd1140f4c4d32bad93a03812dc80286069