src/vs/base/browser/ui/tree/asyncDataTree.ts/AsyncDataTreeNodeListDragAndDrop/getDragLabel
class AsyncDataTreeNodeListDragAndDrop:	getDragLabel(nodes: IAsyncDataTreeNode<TInput, T>[], originalEvent: DragEvent): string | undefined {
		if (this.dnd.getDragLabel) {
			return this.dnd.getDragLabel(nodes.map(node => node.element as T), originalEvent);
		}

		return undefined;
	}