Merge branch '4.4' into 5.1

* 4.4:
  quote all dumped unicode spaces
  Switched from parent type hard-coded FQCN to `::class` keyword.

Author: fabpot

AbstractType.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Form;
 
+use Symfony\Component\Form\Extension\Core\Type\FormType;
 use Symfony\Component\Form\Util\StringUtil;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
@@ -60,6 +61,6 @@ public function getBlockPrefix()
      */
     public function getParent()
     {
-        return 'Symfony\Component\Form\Extension\Core\Type\FormType';
+        return FormType::class;
     }
 }

Tests/Fixtures/ChoiceSubType.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Form\Tests\Fixtures;
 
 use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 
 /**
@@ -38,6 +39,6 @@ public function configureOptions(OptionsResolver $resolver)
      */
     public function getParent(): ?string
     {
-        return 'Symfony\Component\Form\Extension\Core\Type\ChoiceType';
+        return ChoiceType::class;
     }
 }