def last_selected_index(self, value):
        """Store last selected index and update outline rect.

        Parameters
        ==========
        value (integer >= 0; None)
            represents index of last path selected. Or, if
            there's no last selected path, it is None.
        """
        ### set value of last selected index
        self._last_selected_index = value

        ### update outline rect attribute.
        self.update_outline_rect()
Store last selected index and update outline rect.

        Parameters
        ==========
        value (integer >= 0; None)
            represents index of last path selected. Or, if
            there's no last selected path, it is None.
        
nodezator/fileman/dirpanel/main.py