Merge branch '6.3' into 6.4

* 6.3:
  [Form] Fix merging params & files when "multiple" is enabled
  [HttpFoundation] Do not swallow trailing `=` in cookie value
  Handle Sendinblue error responses without a message key
  [Serializer] Fix collecting only first missing constructor argument
  [Messenger] Simplify code
  [Messenger] Fix graceful exit
  [Messenger] Fix DoctrineOpenTransactionLoggerMiddleware
  [Translation] Add missing return type
  [Validator] add missing catalan translations

Author: nicolas-grekas

Extension/HttpFoundation/HttpFoundationRequestHandler.php

@@ -15,6 +15,7 @@
 use Symfony\Component\Form\FormError;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\RequestHandlerInterface;
+use Symfony\Component\Form\Util\FormUtil;
 use Symfony\Component\Form\Util\ServerParams;
 use Symfony\Component\HttpFoundation\File\File;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
@@ -95,7 +96,7 @@ public function handleRequest(FormInterface $form, mixed $request = null)
             }
 
             if (\is_array($params) && \is_array($files)) {
-                $data = array_replace_recursive($params, $files);
+                $data = FormUtil::mergeParamsAndFiles($params, $files);
             } else {
                 $data = $params ?: $files;
             }

NativeRequestHandler.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Form;
 
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Form\Util\FormUtil;
 use Symfony\Component\Form\Util\ServerParams;
 
 /**
@@ -106,7 +107,7 @@ public function handleRequest(FormInterface $form, mixed $request = null)
             }
 
             if (\is_array($params) && \is_array($files)) {
-                $data = array_replace_recursive($params, $files);
+                $data = FormUtil::mergeParamsAndFiles($params, $files);
             } else {
                 $data = $params ?: $files;
             }

Tests/AbstractRequestHandlerTestCase.php

@@ -227,6 +227,42 @@ public function testMergeParamsAndFiles($method)
         $this->assertSame($file, $form->get('field2')->getData());
     }
 
+    /**
+     * @dataProvider methodExceptGetProvider
+     */
+    public function testMergeParamsAndFilesMultiple($method)
+    {
+        $form = $this->createForm('param1', $method, true);
+        $form->add($this->createBuilder('field1', false, ['allow_file_upload' => true, 'multiple' => true])->getForm());
+        $file1 = $this->getUploadedFile();
+        $file2 = $this->getUploadedFile();
+
+        $this->setRequestData($method, [
+            'param1' => [
+                'field1' => [
+                    'foo',
+                    'bar',
+                    'baz',
+                ],
+            ],
+        ], [
+            'param1' => [
+                'field1' => [
+                    $file1,
+                    $file2,
+                ],
+            ],
+        ]);
+
+        $this->requestHandler->handleRequest($form, $this->request);
+        $data = $form->get('field1')->getData();
+
+        $this->assertTrue($form->isSubmitted());
+        $this->assertIsArray($data);
+        $this->assertCount(5, $data);
+        $this->assertSame(['foo', 'bar', 'baz', $file1, $file2], $data);
+    }
+
     /**
      * @dataProvider methodExceptGetProvider
      */

Util/FormUtil.php

@@ -37,4 +37,29 @@ public static function isEmpty(mixed $data): bool
         // not considered to be empty, ever.
         return null === $data || '' === $data;
     }
+
+    /**
+     * Recursively replaces or appends elements of the first array with elements
+     * of second array. If the key is an integer, the values will be appended to
+     * the new array; otherwise, the value from the second array will replace
+     * the one from the first array.
+     */
+    public static function mergeParamsAndFiles(array $params, array $files): array
+    {
+        $result = [];
+
+        foreach ($params as $key => $value) {
+            if (\is_array($value) && \is_array($files[$key] ?? null)) {
+                $value = self::mergeParamsAndFiles($value, $files[$key]);
+                unset($files[$key]);
+            }
+            if (\is_int($key)) {
+                $result[] = $value;
+            } else {
+                $result[$key] = $value;
+            }
+        }
+
+        return array_merge($result, $files);
+    }
 }