src/vs/workbench/services/views/common/treeViewsService.ts/TreeviewsService/removeDragOperationTransfer
class TreeviewsService:	removeDragOperationTransfer(uuid: string | undefined): Promise<T | undefined> | undefined {
		if ((uuid && this._dragOperations.has(uuid))) {
			const operation = this._dragOperations.get(uuid);
			this._dragOperations.delete(uuid);
			return operation;
		}
		return undefined;
	}