Fix the configurability of CoreExtension deps in standalone usage

src/Symfony/Component/Form/Extension/Core/CoreExtension.php

@@ -69,7 +69,7 @@ class CoreExtension extends AbstractExtension
             new Type\TimeType(),
             new Type\TimezoneType(),
             new Type\UrlType(),
-            new Type\FileType(),
+            new Type\FileType($this->translator),
             new Type\ButtonType(),
             new Type\SubmitType(),
             new Type\ResetType(),

src/Symfony/Component/Form/FormFactoryBuilder.php

@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Form;
 
+use Symfony\Component\Form\Extension\Core\CoreExtension;
+
 /**
  * The default implementation of FormFactoryBuilderInterface.
  *
@@ -18,6 +20,8 @@ namespace Symfony\Component\Form;
  */
 class FormFactoryBuilder implements FormFactoryBuilderInterface
 {
+    private $forceCoreExtension;
+
     /**
      * @var ResolvedFormTypeFactoryInterface
      */
@@ -43,6 +47,14 @@ class FormFactoryBuilder implements FormFactoryBuilderInterface
      */
     private $typeGuessers = [];
 
+    /**
+     * @param bool $forceCoreExtension
+     */
+    public function __construct($forceCoreExtension = false)
+    {
+        $this->forceCoreExtension = $forceCoreExtension;
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -144,6 +156,21 @@ class FormFactoryBuilder implements FormFactoryBuilderInterface
     {
         $extensions = $this->extensions;
 
+        if ($this->forceCoreExtension) {
+            $hasCoreExtension = false;
+
+            foreach ($extensions as $extension) {
+                if ($extension instanceof CoreExtension) {
+                    $hasCoreExtension = true;
+                    break;
+                }
+            }
+
+            if (!$hasCoreExtension) {
+                array_unshift($extensions, new CoreExtension());
+            }
+        }
+
         if (\count($this->types) > 0 || \count($this->typeExtensions) > 0 || \count($this->typeGuessers) > 0) {
             if (\count($this->typeGuessers) > 1) {
                 $typeGuesser = new FormTypeGuesserChain($this->typeGuessers);

src/Symfony/Component/Form/Forms.php

@@ -11,8 +11,6 @@
 
 namespace Symfony\Component\Form;
 
-use Symfony\Component\Form\Extension\Core\CoreExtension;
-
 /**
  * Entry point of the Form component.
  *
@@ -105,10 +103,7 @@ final class Forms
      */
     public static function createFormFactoryBuilder()
     {
-        $builder = new FormFactoryBuilder();
-        $builder->addExtension(new CoreExtension());
-
-        return $builder;
+        return new FormFactoryBuilder(true);
     }
 
     /**