Chris Bracken 1b01211ee6 Default return key behaviour to 'done' on iOS (#3655)
This change brings iOS return key behaviour in line with current behaviour on
Android.

* Implements TextInputClient.performAction for iOS Adds FlutterTextInputAction
* enum Defaults return key to 'Done' Ends editing and hides the keyboard if
* 'Done' is pressed

Future work is planned to support configurable return/action key behaviour.
See: #9573, #9210, #8028.
2017-05-05 17:40:52 -07:00
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