docs: def _on_item_clicked(self, item):
          """
          Go to the item position in the editor.
          """
          if item:
              name = item.data(0, QtCore.Qt.UserRole)
              if name:
                  go = name.block.blockNumber()
                  helper = TextHelper(self._editor)
                  if helper.current_line_nbr() != go:
                      helper.goto_line(go, column=name.column)
                  self._editor.setFocus()