# File lib/rbreadline.rb, line 1617
  def _rl_move_vert(to)
    if (@_rl_last_v_pos == to || to > @_rl_screenheight)
      return
    end

    if ((delta = to - @_rl_last_v_pos) > 0)
      @rl_outstream.write("\n"*delta)
      @rl_outstream.write("\r")
      @_rl_last_c_pos = 0
    else
      if(@_rl_term_up)
        @rl_outstream.write(@_rl_term_up*(-delta))
      end
    end
    @_rl_last_v_pos = to        # Now TO is here
  end