docs: def on_notebook_tab_switch(self, notebook, page, page_num, title_label, window, notebook_identifier):
          """Triggered whenever a left-bar notebook tab is changed.
  
          Updates the title of the corresponding notebook and updates the title of the left-bar window in case un-docked.
  
          :param notebook: The GTK notebook where a tab-change occurred
          :param page_num: The page number of the currently-selected tab
          :param title_label: The label holding the notebook's title
          :param window: The left-bar window, for which the title should be changed
          :param notebook_identifier: A string identifying whether the notebook is the upper or the lower one
          """
          title = gui_helper_label.set_notebook_title(notebook, page_num, title_label)
          window.reset_title(title, notebook_identifier)
          self.on_switch_page_check_collapse_button(notebook, page_num)