bug #51761 [Validator] Fix registering "is_valid()" for #[Expression] (nicolas-grekas)

This PR was merged into the 6.4 branch.

Discussion
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[Validator] Fix registering "is_valid()" for `#[Expression]`

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | #50438
| License       | MIT
| Doc PR        | -

`@bendavies` can you please confirm this fixes the issue for you?

Commits
-------

b24d9a00a0 [Validator] Fix registering "is_valid()" for `#[Expression]`

Author: nicolas-grekas

DependencyInjection/FrameworkExtension.php

@@ -173,6 +173,7 @@
 use Symfony\Component\Translation\Translator;
 use Symfony\Component\Uid\Factory\UuidFactory;
 use Symfony\Component\Uid\UuidV4;
+use Symfony\Component\Validator\Constraints\ExpressionLanguageProvider;
 use Symfony\Component\Validator\ConstraintValidatorInterface;
 use Symfony\Component\Validator\Mapping\Loader\PropertyInfoLoader;
 use Symfony\Component\Validator\ObjectInitializerInterface;
@@ -1664,6 +1665,10 @@ private function registerValidationConfiguration(array $config, ContainerBuilder
         if (!class_exists(ExpressionLanguage::class)) {
             $container->removeDefinition('validator.expression_language');
         }
+
+        if (!class_exists(ExpressionLanguageProvider::class)) {
+            $container->removeDefinition('validator.expression_language_provider');
+        }
     }
 
     private function registerValidatorMapping(ContainerBuilder $container, array $config, array &$files): void

Resources/config/validator.php

@@ -15,6 +15,7 @@
 use Symfony\Component\Cache\Adapter\PhpArrayAdapter;
 use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
 use Symfony\Component\Validator\Constraints\EmailValidator;
+use Symfony\Component\Validator\Constraints\ExpressionLanguageProvider;
 use Symfony\Component\Validator\Constraints\ExpressionValidator;
 use Symfony\Component\Validator\Constraints\NoSuspiciousCharactersValidator;
 use Symfony\Component\Validator\Constraints\NotCompromisedPasswordValidator;
@@ -82,11 +83,16 @@
 
         ->set('validator.expression_language', ExpressionLanguage::class)
             ->args([service('cache.validator_expression_language')->nullOnInvalid()])
+            ->call('registerProvider', [
+                service('validator.expression_language_provider')->ignoreOnInvalid(),
+            ])
 
         ->set('cache.validator_expression_language')
             ->parent('cache.system')
             ->tag('cache.pool')
 
+        ->set('validator.expression_language_provider', ExpressionLanguageProvider::class)
+
         ->set('validator.email', EmailValidator::class)
             ->args([
                 abstract_arg('Default mode'),