    # File lib/vmail/imap_client.rb, line 400
        def add_more_message_line(res, start_seqno)
          log "add_more_message_line for start_seqno #{start_seqno}"
          if @all_search
            return res if start_seqno.nil?
            remaining = start_seqno - 1
          else # filter search
            remaining = (@ids.index(start_seqno) || 1) - 1
          end
          if remaining < 1
            log "none remaining"
            return "showing all matches\n" + res
          end
          log "remaining messages: #{remaining}"
          ">  Load #{[100, remaining].min} more messages. #{remaining} remaining.\n" + res
        end