Summary:
The TextInput when configured with `multiline=true` has a minor issue due to which if the initial text doesn't fit in one line, the input won't span multiple lines. The root cause of the problem is that the `onChange` event is not fired for the initial render. This issue has been reported on open-source: 481f560f64
This is an attempt to fix this problem by moving the logic to fire the event to the method that updates the content size. This way we can guarantee that anytime the content size changes we'll trigger the JS event.
The downside of this approach is that it's possible that multiple events get fired for a single character change. As per the comment that was removed, this was already happening when adding a character that when rendered, would increase the content size. By moving the code to the new place, this can happen more often (twice per character tapped). Let me know if you think this is an issue.
I don't know this code much, so please be careful reviewing. I'm happy to add more test cases I may have missed to the test plan :).
Reviewed By: nicklockwood
Differential Revision: D3348218
fbshipit-source-id: 6b457624c9126e771c326eac61cd1cdd6496671d
bbc6139baf