code: func (l *List) Append(format string, args ...interface{}) {
  	s := fmt.Sprintf(format, args...)
  	l.content = append(l.content, s)
  
  	// adjust at if we are not in a paging operation
  	if l.paging {
  		return
  	}
  	l.at = len(l.content) - l.trueH
  	if l.at < 0 {
  		l.at = 0
  	}
  }
docs: // Append adds a line of text to the list.  Append must be called from queue.