code: def tab_navigation_mru(self, forward=True):
          
          self.tabs_switcher = TabSwitcherWidget(self, self.stack_history,
                                                 self.tabs)
          self.tabs_switcher.show()
          self.tabs_switcher.select_row(1 if forward else -1)
          self.tabs_switcher.setFocus()
docs: Tab navigation with "most recently used" behaviour.
  
          It's fired when pressing 'go to previous file' or 'go to next file'
          shortcuts.
  
          forward:
              True: move to next file
              False: move to previous file