<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 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()