code: def alignment_changed(self, settings, key, user_data):
          
          RectCalculator.set_final_window_rect(self.settings, self.guake.window)
          self.guake.set_tab_position()
          self.guake.force_move_if_shown()
docs: If the gconf var window_halignment be changed, this method will
          be called and will call the move function in guake.