code: def update_selected_cb(parents, combobox):
      
      if parents is not None and len(parents) == 0:
          combobox.setCurrentIndex(0)
      else:
          item = parents[-1]
          for i in range(combobox.count()):
              if combobox.itemData(i) == item:
                  combobox.setCurrentIndex(i)
                  break
docs: Update the combobox with the selected item based on the parents.
  
      Parameters
      ----------
      parents : list of :class:`FoldScopeHelper`
      combobox : :class:`qtpy.QtWidets.QComboBox`
          The combobox to populate
  
      Returns
      -------
      None