code: func (s *Sheet) maybeAddCol(cellCount int) {
  	if cellCount > s.MaxCol {
  		loopCnt := cellCount - s.MaxCol
  		currIndex := s.MaxCol + 1
  		for i := 0; i < loopCnt; i++ {
  
  			col := &Col{
  				style:     NewStyle(),
  				Min:       currIndex,
  				Max:       currIndex,
  				Hidden:    false,
  				Collapsed: false}
  			s.Cols = append(s.Cols, col)
  			currIndex++
  		}
  
  		s.MaxCol = cellCount
  	}
  }
docs: // Make sure we always have as many Cols as we do cells.