rebuild method

@override void rebuild()

Rebuilds the element.

Implementation

@override
void rebuild() {
  final pos = widget as Positioned;
  if (childElement != null &&
      Widget.canUpdate(childElement!.widget, pos.child)) {
    childElement!.update(pos.child);
  } else {
    childElement?.unmount();
    childElement = pos.child.createElement();
    childElement!.mount(this);
  }
}