in excel-addin/src/taskpane/taskpane.js [231:237]
function _advance_line(start_idx, texts) {
const endline_idx = texts.indexOf('\n', start_idx);
if (endline_idx == -1) {
return {result: "", next_idx: -1};
}
return {result: _strip(texts.slice(start_idx, endline_idx-1).join("")).split(CELL_SEPARATOR), next_idx: endline_idx};
}