code: def __setup_menu(self):
          
          self.menu.clear()
          if self.data:
              actions = self.menu_actions
          else:
              actions = (self.new_action, self.open_action)
              self.setFocus() # --> Editor.__get_focus_editortabwidget
          add_actions(self.menu, list(actions) + self.__get_split_actions())
          self.close_action.setEnabled(self.is_closable)
docs: Setup tab context menu before showing it