anchor.diff:            ),
            ]
          ),
  -       decoration: Theme.of(context).platform == TargetPlatform.iOS ? new BoxDecoration(border: new Border(top: new BorderSide(color: Colors.grey[200]))) : null),//new
  +       decoration: Theme.of(context).platform == TargetPlatform.iOS ? new BoxDecoration(border: new Border(top: new BorderSide(color: Colors.grey[200]))) : null),
      );
     }
   }
  
positive.code: 
    void _handleSubmitted(String text) {
      _textController.clear();
      ChatMessage message = new ChatMessage(
        text: text,
        animationController: new AnimationController(
  
negative.code:             new Flexible(
                child: new TextField(
                  controller: _textController,
                  onChanged: (String text)  {
                    setState(() {
                      _isComposing = text.length > 0;
                    });
  