Issue #3181689 by jsacksick: JSON Search API facets broken with latest Facets release

modules/jsonapi_search_api_facets/src/Plugin/facets/url_processor/JsonApiQueryString.php

@@ -130,12 +130,9 @@ class JsonApiQueryString extends QueryString {
     // Set the url alias from the facet object.
     $this->urlAlias = $facet->getUrlAlias();
 
-    // Grab the original field for use in the filter URLs.
-    $request = $this->request;
-    // We do not need to use ::getUrlForRequest, as we know this URL processor
-    // is being executed on a JSON:API Search API resource.
-    $requestUrl = Url::createFromRequest($request);
-    $routeParameters = $this->getUrlRouteParameters();
+    $facet_source_path = $facet->getFacetSource()->getPath();
+    $request = $this->getRequestByFacetSourcePath($facet_source_path);
+    $requestUrl = $this->getUrlForRequest($facet_source_path, $request);
 
     $original_filter_params = [];
     foreach ($this->getActiveFilters() as $facet_id => $value) {
@@ -252,9 +249,6 @@ class JsonApiQueryString extends QueryString {
         }
         $result_get_params->add($params);
       }
-      if (!empty($routeParameters)) {
-        $url->setRouteParameters($routeParameters);
-      }
       if ($result_get_params->all() !== [$this->filterKey => []]) {
         $new_url_params = $result_get_params->all();
         // Set the new url parameters.