src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/_parseIndexedCellOptions
class NotebookEditorWidget:	private _parseIndexedCellOptions(options: INotebookEditorOptions | undefined) {
		if (options?.indexedCellOptions) {
			// convert index based selections
			const cell = this.cellAt(options.indexedCellOptions.index);
			if (cell) {
				return {
					resource: cell.uri,
					options: {
						selection: options.indexedCellOptions.selection,
						preserveFocus: false
					}
				};
			}
		}

		return undefined;
	}