# File lib/sup/buffer.rb, line 231
  def raise_to_front buf
    @buffers.delete(buf) or return
    if @buffers.length > 0 && @buffers.last.force_to_top?
      @buffers.insert(-2, buf)
    else
      @buffers.push buf
    end
    focus_on @buffers.last
    @dirty = true
  end