src/vs/base/browser/ui/tree/asyncDataTree.ts/CompressibleAsyncDataTree/constructor
class CompressibleAsyncDataTree:	constructor(
		user: string,
		container: HTMLElement,
		virtualDelegate: IListVirtualDelegate<T>,
		private compressionDelegate: ITreeCompressionDelegate<T>,
		renderers: ICompressibleTreeRenderer<T, TFilterData, any>[],
		dataSource: IAsyncDataSource<TInput, T>,
		options: ICompressibleAsyncDataTreeOptions<T, TFilterData> = {}
	) {
		super(user, container, virtualDelegate, renderers, dataSource, options);
		this.filter = options.filter;
	}