docs: def reset_clipboard(self):
          """ Resets the clipboard, so that old elements do not pollute the new selection that is copied into the
              clipboard.
  
          :return:
          """
          # reset selections
          for state_element_attr in ContainerState.state_element_attrs:
              self.model_copies[state_element_attr] = []
  
          # reset parent state_id the copied elements are taken from
          self.copy_parent_state_id = None
  
          self.reset_clipboard_mapping_dicts()