code: function _findFocusTd($newTable, rowIndex, colIndex) {
    const tableData = dataHandler.createTableData($newTable);
    const newRowIndex = dataHandler.findRowMergedLastIndex(tableData, rowIndex, colIndex) + 1;
    const cellElementIndex = dataHandler.findElementIndex(tableData, newRowIndex, colIndex);
  
    return $newTable.find('tr').eq(cellElementIndex.rowIndex).find('td')[cellElementIndex.colIndex];
  }
docs: Find focus td element.
  @param {jQuery} $newTable - changed table jQuery element
  @param {number} rowIndex - row index of table data
  @param {number} colIndex - column index of tabld data
  @returns {HTMLElement}
  @private