Merge branch '5.4' into 6.0

* 5.4: (26 commits)
  [Dotenv] Fix testBootEnv() to start from a fresh context
  fix tests
  relax expected exception message for forward-compatibility with 5.4
  fix expected exception messages after changes made in Definition class
  [DependencyInjection] show class name on DI errors
  skip command completion tests with older Symfony Console versions
  Use GitHub issue form templates
  Fix CS
  add ResponseIsUnprocessable
  Add missing translations for Persian (fa)
  skip command completion tests with older Symfony Console versions
  prevent issues with timezones and DST by using only UNIX timestamps
  Add the missing translations for Bahasa Indonesia (id)
  [Finder] Fix .gitignore infinite loop
  Update README.md
  fix messenger DI dependency for registerAttributeForAutoconfiguration
  [Messenger] Autoconfigurable attributes
  Fix deprecations on PHP 8.2
  [Dotenv] Fix testLoadEnv() .env.dist isolation
  Since 5.0, throws \UnexpectedValueException has been removed.
  ...

Author: nicolas-grekas

CHANGELOG.md

@@ -11,6 +11,7 @@ CHANGELOG
 
  * Add `DoctrineOpenTransactionLoggerMiddleware` to log when a transaction has been left open
  * Deprecate `PdoCacheAdapterDoctrineSchemaSubscriber` and add `DoctrineDbalCacheAdapterSchemaSubscriber` instead
+ * `UniqueEntity` constraint retrieves a maximum of two entities if the default repository method is used.
 
 5.3
 ---

Validator/Constraints/UniqueEntityValidator.php

@@ -134,7 +134,18 @@ public function validate(mixed $entity, Constraint $constraint)
             $repository = $em->getRepository(\get_class($entity));
         }
 
-        $result = $repository->{$constraint->repositoryMethod}($criteria);
+        $arguments = [$criteria];
+
+        /* If the default repository method is used, it is always enough to retrieve at most two entities because:
+         * - No entity returned, the current entity is definitely unique.
+         * - More than one entity returned, the current entity cannot be unique.
+         * - One entity returned the uniqueness depends on the current entity.
+         */
+        if ('findBy' === $constraint->repositoryMethod) {
+            $arguments = [$criteria, null, 2];
+        }
+
+        $result = $repository->{$constraint->repositoryMethod}(...$arguments);
 
         if ($result instanceof \IteratorAggregate) {
             $result = $result->getIterator();