src/vs/base/browser/ui/selectBox/selectBoxCustom.ts/SelectBoxList/onListFocus
class SelectBoxList:	private onListFocus(e: IListEvent<ISelectOptionItem>) {
		// Skip during initial layout
		if (!this._isVisible || !this._hasDetails) {
			return;
		}

		this.updateDetail(e.indexes[0]);
	}