src/vs/workbench/contrib/codeEditor/browser/outline/documentSymbolsOutline.ts/DocumentSymbolBreadcrumbsSource/_isFiltered
class DocumentSymbolBreadcrumbsSource:	private _isFiltered(element: TreeElement): boolean {
		if (!(element instanceof OutlineElement)) {
			return false;
		}
		const key = `breadcrumbs.${DocumentSymbolFilter.kindToConfigName[element.symbol.kind]}`;
		let uri: URI | undefined;
		if (this._editor && this._editor.getModel()) {
			const model = this._editor.getModel() as ITextModel;
			uri = model.uri;
		}
		return !this._textResourceConfigurationService.getValue<boolean>(uri, key);
	}