Does not work properly with StatefulWidget.

[AhmetAY]

When I change Item class from StatelessWidget to StatefulWidget, it does not work properly. A weird situation occurs in ui.
New form of Item class:

class Item extends StatefulWidget {
  Item({
    this.data,
    this.isFirst,
    this.isLast,
    this.draggingMode,
  });

  final ItemData data;
  final bool isFirst;
  final bool isLast;
  final DraggingMode draggingMode;

@override
  State<StatefulWidget> createState() => new _ItemState(data: data, isFirst: isFirst, isLast: isLast, draggingMode: draggingMode);
}

class _ItemState extends State<Item> {
  _ItemState({
    this.data,
    this.isFirst,
    this.isLast,
    this.draggingMode,
  });

  final ItemData data;
  final bool isFirst;
  final bool isLast;
  final DraggingMode draggingMode;

[knopp]

Stateless/Stateful shouldn't make any difference here. We have reorderable items with stateful widgets with them. You code doesn't show everything, i.e. the build method is missing.

[AhmetAY]

Stateless/Stateful shouldn't make any difference here. We have reorderable items with stateful widgets with them. You code doesn't show everything, i.e. the build method is missing.

I just showed the changed part.

[knopp]

Closing for inactivity. If you have problem with stateless widgets inside list please provide a working example.