bug #45909 [Form][TwigBundle] reset Twig form theme resources between…

… requests (xabbuh)

This PR was merged into the 4.4 branch.

Discussion
----------

[Form][TwigBundle] reset Twig form theme resources between requests

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #45229
| License       | MIT
| Doc PR        |

Commits
-------

873a86e reset Twig form theme resources between requests

src/Symfony/Bundle/TwigBundle/DependencyInjection/TwigExtension.php

@@ -18,9 +18,11 @@
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\Form\AbstractRendererEngine;
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Symfony\Component\Mailer\Mailer;
 use Symfony\Component\Translation\Translator;
+use Symfony\Contracts\Service\ResetInterface;
 use Twig\Extension\ExtensionInterface;
 use Twig\Extension\RuntimeExtensionInterface;
 use Twig\Loader\LoaderInterface;
@@ -40,6 +42,12 @@ public function load(array $configs, ContainerBuilder $container)
 
         if (class_exists(\Symfony\Component\Form\Form::class)) {
             $loader->load('form.xml');
+
+            if (is_subclass_of(AbstractRendererEngine::class, ResetInterface::class)) {
+                $container->getDefinition('twig.form.engine')->addTag('kernel.reset', [
+                    'method' => 'reset',
+                ]);
+            }
         }
 
         if (interface_exists(\Symfony\Component\Templating\EngineInterface::class)) {

src/Symfony/Component/Form/AbstractRendererEngine.php

@@ -11,12 +11,14 @@
 
 namespace Symfony\Component\Form;
 
+use Symfony\Contracts\Service\ResetInterface;
+
 /**
  * Default implementation of {@link FormRendererEngineInterface}.
  *
  * @author Bernhard Schussek <bschussek@gmail.com>
  */
-abstract class AbstractRendererEngine implements FormRendererEngineInterface
+abstract class AbstractRendererEngine implements FormRendererEngineInterface, ResetInterface
 {
     /**
      * The variable in {@link FormView} used as cache key.
@@ -197,4 +199,12 @@ private function loadResourceForBlockNameHierarchy(string $cacheKey, FormView $v
 
         return false;
     }
+
+    public function reset(): void
+    {
+        $this->themes = [];
+        $this->useDefaultThemes = [];
+        $this->resources = [];
+        $this->resourceHierarchyLevels = [];
+    }
 }