re add method (#313)

Author: gilles-g

Filter/Form/FilterTypeExtension.php

@@ -40,6 +40,14 @@ public function configureOptions(OptionsResolver $resolver)
         ));
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getExtendedType()
+    {
+        return FormType::class;
+    }
+
     /**
      * @return iterable
      */