Summary:
The problem was recently introduced in the last refactoring of the Text module.
There are two problem actually:
(1) Compare this current code with stable version.
In the stable version the event is only triggered here:
https://github.com/facebook/react-native/blob/0.52-stable/Libraries/Text/RCTTextField.m#L132-L140
In the new version the event is triggered in two places (which is obviously wrong).
(2) Executing `[_eventDispatcher sendTextEventWithType:RCTTextEventTypeChange:...]` and _onChange() actually do the same thing.
Historically, the single-line <TextInput> used the first approach and multi-line used second one. When we unify the logic, mixed both of them, which was apparenly wrong.
So, we have to remove another call of `[_eventDispatcher sendTextEventWithType:RCTTextEventTypeChange:...]`.
The the future we have to completly remove usage of `_eventDispatcher` from this component.
Depends on D6854770.
Reviewed By: fkgozali
Differential Revision: D6869678
fbshipit-source-id: 6705ee8dda2681ae184ef6716238cc8b62efeff1
d7fa81f181