[KEYCLOAK-7950] - Fixes user pagination when using filtering users members of groups

common/src/main/java/org/keycloak/common/util/MultivaluedHashMap.java

@@ -33,6 +33,14 @@ public class MultivaluedHashMap<K, V> extends HashMap<K, List<V>>
    public MultivaluedHashMap() {
    }
 
+   public MultivaluedHashMap(Map<K, List<V>> map) {
+      if (map == null) {
+         throw new IllegalArgumentException("Map can not be null");
+      }
+      putAll(map);
+   }
+
+
    public MultivaluedHashMap(MultivaluedHashMap<K, V> config) {
       addAll(config);
    }