Summary:
There's an edge case in the `RefreshControl` which causes it to show as refreshing when the state is set to false. When the component is initialized with `refreshing` set to `true` on initial render but set to `false` before `layoutSubviews` is called, it will call `beginRefresh` and ignore its state. That's because `layoutSubviews` never checks if `_currentRefreshingState` is in fact still `true`, it merely assumes it is.
This is fixed by simply doing a check for `_currentRefreshingState` before entering `beginRefresh` from `layoutSubviews`.
Closes https://github.com/facebook/react-native/pull/7556
Differential Revision: D3300124
fbshipit-source-id: d1dce8612e2c03b1f14284d513803d00af4b5c8a