src/vs/workbench/contrib/preferences/browser/settingsWidgets.ts/ListSettingListModel/selectNext
class ListSettingListModel:	selectNext(): void {
		if (typeof this._selectedIdx === 'number') {
			this._selectedIdx = Math.min(this._selectedIdx + 1, this._dataItems.length - 1);
		} else {
			this._selectedIdx = 0;
		}
	}