docs: def prepare_recently_opened_state_machines_list_for_storage(self):
          """ Reduce number of paths in the recent opened state machines to limit from gui config """
          from rafcon.gui.singleton import global_gui_config
          num = global_gui_config.get_config_value('NUMBER_OF_RECENT_OPENED_STATE_MACHINES_STORED')
          state_machine_paths = self.get_config_value('recently_opened_state_machines', [])
          self.set_config_value('recently_opened_state_machines', state_machine_paths[:num])