Flutter TexField and TextFormField duplicates text when using initial value or controller to set initial text

Question

Within a flutter application that has TextField or TextFormField the text can get duplicated upon first time data entry.

When first entering a keypress, within a field that already has text pre-filled, the text duplicates then your keypress is attached.

I am experiencing something that exhibits this behavior on my Samsung Galaxy S7, S8 and S9 (only devices I have to test with). This doesn't occur within the emulator (Galaxy Nexus9 and Pixel 2).

If I place a space at the end of the field, this problem doesn't happen, however, if I tap in middle of a pre filled field (using controller or initialValue) and press a key it does occur.

Here is a barebones source example:

class SampleTextFormPage extends StatefulWidget {
    @override
    State<StatefulWidget> createState() => new _SampleTextFormPage();
}

class _SampleTextFormPage extends State<SampleTextFormPage> {
    final _scaffoldKey = new GlobalKey<ScaffoldState>();

    TextEditingController _txtController;

    @override
    void initState() {
        super.initState();

        _txtController = TextEditingController(text:'Using Controller');
    }

    @override
    Widget build(BuildContext context) { Scaffold scaffold = new Scaffold(
        key: _scaffoldKey,
        appBar: new AppBar(
            title: new Text('Text Entry',
                style: const TextStyle(
                    color: Colors.white)
            ),
            backgroundColor: Colors.indigo
        ),
        body:  Column(children: [
            //field 1
            TextField(
                 autocorrect: false,
                 autofocus: true,
                 controller: _txtController,
            ),

           //field 2
           TextFormField(
               autocorrect: false,
               autofocus: true,
               initialValue: 'Using initialValue',
           )
        ])
    );

    return scaffold;
    }
}

Note: I am on the latest release of flutter and I have reverted to multiple versions of Flutter (all the way to the first release that supports Dart 2) and this problem still exists.

Answer 1

I had same issue and fixed it with this simple temporary solution: just add to initialValue's end a space. Example:

initialValue: controller.text + ' ',