bug #30396 [Form] Avoid a form type extension appears many times in d…

…ebug:form (markitosgv)

This PR was merged into the 4.2 branch.

Discussion
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[Form] Avoid a form type extension appears many times in debug:form

| Q             | A
| ------------- | ---
| Branch?       | 4.2
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #30394    <!-- #-prefixed issue number(s), if any -->
| License       | MIT

This PR fixes #30394. Avoid a form type extension appears many times in debug:form command. This is caused by new 4.2 feature getExtendedTypes().

Commits
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c4be39c [Form] Fixes debug:form appears many times as type extensions configured with new getExtendedTypes method

src/Symfony/Component/Form/DependencyInjection/FormPass.php

@@ -102,9 +102,9 @@ private function processFormTypeExtensions(ContainerBuilder $container)
             } elseif (method_exists($serviceDefinition->getClass(), 'getExtendedTypes')) {
                 $extendsTypes = false;
 
+                $typeExtensionsClasses[] = $serviceDefinition->getClass();
                 foreach ($serviceDefinition->getClass()::getExtendedTypes() as $extendedType) {
                     $typeExtensions[$extendedType][] = new Reference($serviceId);
-                    $typeExtensionsClasses[] = $serviceDefinition->getClass();
                     $extendsTypes = true;
                 }