docs: function _updateMergeStartIndex(tableData, startRowIndex, endRowIndex) {
    tableData.slice(endRowIndex + 1).forEach(row => {
      row.forEach(cell => {
        if (util.isExisty(cell.rowMergeWith) && cell.rowMergeWith >= startRowIndex) {
          cell.rowMergeWith = endRowIndex + 1;
        }
      });
    });
  }