bringToFront method
void
bringToFront()
Implementation
void bringToFront() {
final selection = _selected.toList();
for (final key in selection) {
final index = nodes.indexWhere((e) => e.key == key);
if (index == -1) continue;
final current = nodes[index];
nodes.removeAt(index);
nodes.add(current);
}
notifyListeners();
}