rebuild method

@override void rebuild()

Rebuilds the element.

Implementation

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