code: def open_last_closed(self):
          
          editorstack = self.get_current_editorstack()
          last_closed_files = editorstack.get_last_closed_files()
          if (len(last_closed_files) > 0):
              file_to_open = last_closed_files[0]
              last_closed_files.remove(file_to_open)
              editorstack.set_last_closed_files(last_closed_files)
              self.load(file_to_open)
docs: Reopens the last closed tab.