src/vs/base/parts/quickinput/browser/quickInputList.ts/QuickInputList/setSelectedElements
class QuickInputList:	setSelectedElements(items: IQuickPickItem[]) {
		this.list.setSelection(items
			.filter(item => this.elementsToIndexes.has(item))
			.map(item => this.elementsToIndexes.get(item)!));
	}