Summary:
Normally when a `ref` prop supplied to a component is changed, the old `ref` receives `null` and the new `ref` receives the active component instance.
However, the current implementation of `ScrollView` has a bug where this does not happen (i.e. changing `ref` or `innerViewRef` does not cause either the old or new refs to be updated). This bug is due to a subtle issue with how `ScrollView` internally memoizes the `ref` (or `innerViewRef`) that is passed into the native component.
This commit fixes this behavior so that `ScrollView`'s `ref` and `innerViewRef` have the correct behavior.
Changelog:
[General][Fixed] When a ScrollView's `ref` or `innnerViewRef` changes, the old ref will now be invoked with `null` and the new ref with the active instance. (Previously, changing `ref` or `innerViewRef` on a `ScrollView` would be treated as though the ref had not changed at all.)
Reviewed By: sammy-SC
Differential Revision: D41208895
fbshipit-source-id: b465f666076edbef410cdf9661e040e1d8fa0404
Tim YungandFacebook GitHub Bot
7cf4cf3afb