code: static void setCurrentScene(@NonNull View view, @Nullable Scene scene) {
          view.setTag(R.id.current_scene, scene);
      }
docs: Set the scene that the given view is in. The current scene is set only
  on the root view of a scene, not for every view in that hierarchy. This
  information is used by Scene to determine whether there is a previous
  scene which should be exited before the new scene is entered.
  
  @param view The view on which the current scene is being set