code: def increment_display_ref_count(self, amount: int=1):
          
          display_ref_count = self.__display_ref_count
          self.__display_ref_count += amount
          if display_ref_count == 0:
              self.__is_master = True
          if self.__data_item:
              for _ in range(amount):
                  self.__data_item.increment_data_ref_count()
docs: Increment display reference count to indicate this library item is currently displayed.