# File lib/sup/modes/scroll-mode.rb, line 46
  def draw
    ensure_mode_validity
    (@topline ... @botline).each { |ln| draw_line ln }
    ((@botline - @topline) ... buffer.content_height).each do |ln|
      if @twiddles
        buffer.write ln, 0, "~", :color => :twiddle_color
      else
        buffer.write ln, 0, ""
      end
    end
    @status = "lines #{@topline + 1}:#{@botline}/#{lines}"
  end