anchor.diff:                label: Text("getPermissionStatus"),
               ),
             ),
  -          Positioned(
  -            bottom: 360.0,
  -            right: 10.0,
  -            child: FloatingActionButton.extended(
  -              onPressed: () async {
  -                dispose();
  -              },
  -              label: Text("dispose"),
  -            ),
  -          ),
           ],
         ),
       );
  
positive.code:               onPressed: _toggleListening,
                label: Text(() {
                  if (_positionStreamSubscription == null) {
                    return "getPositionStream = off";
                  } else {
                    return "getPositionStream ="
                        " ${_positionStreamSubscription.isPaused ? "off" : "on"}";
  
negative.code:         _positionStreamSubscription.cancel();
          _positionStreamSubscription = null;
        }).listen((position) => setState(() => _positionItems.add(
            _PositionItem(_PositionItemType.position, position.toString()))));
        _positionStreamSubscription.pause();
      }
  
  