Select row in list widget based on a number of steps with direction.

        Steps can be positive (next rows) or negative (previous rows).

def select_row(self, steps):
        """Select row in list widget based on a number of steps with direction.

        Steps can be positive (next rows) or negative (previous rows).
        """
        row = self.current_row() + steps
        if 0 <= row < self.count():
            self.set_current_row(row)