in src/connectors/sheets-connector.js [148:159]
appendDataList(tabId, newItems, options) {
options = options || {};
let sheets = options.sheets || {};
// Use the last row index as base for appending items.
let lastRowIndex = this.getTabLastRow(tabId) + 1;
this.appendDataListExec(tabId, newItems, (item, rowIndex) => {
rowIndex = lastRowIndex;
lastRowIndex++;
return rowIndex;
} /* rowIndexFunc */);
}