anchor.diff:        focusNode: FocusNode(),
         cursorColor: Colors.red,
         backgroundCursorColor: Colors.blue,
  -      style: Typography.material2018(platform: TargetPlatform.android).black.subtitle1.copyWith(fontFamily: 'Roboto'),
  +      style: Typography.material2018(platform: TargetPlatform.android).black.subtitle1!.copyWith(fontFamily: 'Roboto'),
         keyboardType: TextInputType.text,
         inputFormatters: <TextInputFormatter>[LengthLimitingTextInputFormatter(6)],
         onChanged: (String s) => controller.text += ' onChanged',
  
positive.code:       focusNode: FocusNode(),
        cursorColor: Colors.red,
        backgroundCursorColor: Colors.blue,
        style: Typography.material2018(platform: TargetPlatform.android).black.subtitle1.copyWith(fontFamily: 'Roboto'),
        keyboardType: TextInputType.text,
      );
  
  
negative.code:               focusNode: FocusNode(),
                cursorColor: Colors.red,
                backgroundCursorColor: Colors.blue,
                style: Typography.material2018(platform: TargetPlatform.android).black.subtitle1!.copyWith(fontFamily: 'Roboto'),
                keyboardType: TextInputType.text,
                inputFormatters: <TextInputFormatter>[LengthLimitingTextInputFormatter(6)],
              ),
  