src/vs/base/browser/ui/list/listWidget.ts/ListViewDragAndDrop/getDragLabel
class ListViewDragAndDrop:	getDragLabel?(elements: T[], originalEvent: DragEvent): string | undefined {
		if (this.dnd.getDragLabel) {
			return this.dnd.getDragLabel(elements, originalEvent);
		}

		return undefined;
	}