# File control/DocumentTable/DocumentTable.rb, line 204
  def doc_up
    unless (doc_up_disabled?) then
      i = @doc_up_call_index
      j = @doc_up_call_index - 1
      @document_list[i], @document_list[j] = @document_list[j], @document_list[i]
      @doc_opt_list[i], @doc_opt_list[j] = @doc_opt_list[j], @doc_opt_list[i]
      @src.write_document_list
    end
    nil
  end