docs: function _expandColMergedRange(tableData, tableRange, rowIndex, colIndex) {
    const rowData = tableData[rowIndex];
    const cellData = rowData[colIndex];
    const {colMergeWith} = cellData;
    let lastColMergedIndex = -1;
  
    if (util.isExisty(colMergeWith)) {
      if (colMergeWith < tableRange.start.colIndex) {
        tableRange.start.colIndex = colMergeWith;
      }
  
      lastColMergedIndex = colMergeWith + rowData[colMergeWith].colspan - 1;
    } else if (cellData.colspan > 1) {
      lastColMergedIndex = colIndex + cellData.colspan - 1;
    }
  
    if (lastColMergedIndex > tableRange.end.colIndex) {
      tableRange.end.colIndex = lastColMergedIndex;
    }
  }