src/vs/workbench/contrib/preferences/browser/settingsWidgets.ts/ListSettingWidget/renderDropdown
class ListSettingWidget:	private renderDropdown(value: ObjectKey, rowElement: HTMLElement): SelectBox {
		if (value.type !== 'enum') {
			throw new Error('Valuetype must be enum.');
		}
		const selectBox = this.createBasicSelectBox(value);

		const wrapper = $('.setting-list-object-list-row');
		selectBox.render(wrapper);
		rowElement.appendChild(wrapper);

		return selectBox;
	}