code: @UiThread
      public boolean popToTag(@NonNull String tag) {
          ThreadUtils.ensureMainThread();
  
          return popToTag(tag, null);
      }
docs: Pops all {@link Controller}s until the Controller with the passed tag is at the top
  
  @param tag The tag being popped to
  @return Whether or not any {@link Controller}s were popped in order to get to the transaction with the passed tag