code: function _expandMergedRange(tableData, tableRange) {
    let rangeStr = '';
  
    while (rangeStr !== JSON.stringify(tableRange)) {
      rangeStr = JSON.stringify(tableRange);
  
      _expandRowMergedRange(tableData, tableRange, 'start');
      _expandRowMergedRange(tableData, tableRange, 'end');
  
      util.range(tableRange.start.rowIndex, tableRange.end.rowIndex + 1).forEach(rowIndex => {
        _expandColMergedRange(tableData, tableRange, rowIndex, tableRange.start.colIndex);
        _expandColMergedRange(tableData, tableRange, rowIndex, tableRange.end.colIndex);
      });
    }
  
    return tableRange;
  }
docs: Expand table range by merge properties like colspan, rowspan.
  @param {Array.<Array.<object>>} tableData - table data
  @param {{
  start: {rowIndex: number, colIndex: number},
  end: {rowIndex: number, colIndex: number}
  }} tableRange - table range
  @returns {{
  start: {rowIndex: number, colIndex: number},
  end: {rowIndex: number, colIndex: number}
  }}
  @private