Merge branch '6.3' into 6.4

* 6.3:
  Add missing return type
  [HttpClient] Fix pausing responses before they start when using curl
  separate child and parent context in NotificationEmail on writes
  [Mailer] [Mailgun] Fix sender header encoding
  do not overwrite the cache key when it is false
  [Mailer] Throw TransportException when unable to read from socket
  [Serializer] Rewrite `AbstractObjectNormalizer::createChildContext()` to use the provided `cache_key` from original context when creating child contexts
  [HttpClient] Fix error chunk creation in passthru
  Adjusting and removing the 'review' attribute from the pt_br translation XML.
  [Serializer] Take unnamed variadic parameters into account when denormalizing
  Fix context data and display extra data

Mime/NotificationEmail.php

@@ -174,6 +174,26 @@ public function getHtmlTemplate(): ?string
         return '@email/'.$this->theme.'/notification/body.html.twig';
     }
 
+    /**
+     * @return $this
+     */
+    public function context(array $context): static
+    {
+        $parentContext = [];
+
+        foreach ($context as $key => $value) {
+            if (\array_key_exists($key, $this->context)) {
+                $this->context[$key] = $value;
+            } else {
+                $parentContext[$key] = $value;
+            }
+        }
+
+        parent::context($parentContext);
+
+        return $this;
+    }
+
     public function getContext(): array
     {
         return array_merge($this->context, parent::getContext());

Tests/Mime/NotificationEmailTest.php

@@ -128,4 +128,54 @@ public function testPublicMailSubject()
         $headers = $email->getPreparedHeaders();
         $this->assertSame('Foo', $headers->get('Subject')->getValue());
     }
+
+    public function testContext()
+    {
+        $email = new NotificationEmail();
+        $email->context(['some' => 'context']);
+
+        $this->assertSame([
+            'importance' => NotificationEmail::IMPORTANCE_LOW,
+            'content' => '',
+            'exception' => false,
+            'action_text' => null,
+            'action_url' => null,
+            'markdown' => false,
+            'raw' => false,
+            'footer_text' => 'Notification e-mail sent by Symfony',
+            'some' => 'context',
+        ], $email->getContext());
+
+        $context = $email->getContext();
+        $context['foo'] = 'bar';
+        $email->context($context);
+
+        $this->assertSame([
+            'importance' => NotificationEmail::IMPORTANCE_LOW,
+            'content' => '',
+            'exception' => false,
+            'action_text' => null,
+            'action_url' => null,
+            'markdown' => false,
+            'raw' => false,
+            'footer_text' => 'Notification e-mail sent by Symfony',
+            'some' => 'context',
+            'foo' => 'bar',
+        ], $email->getContext());
+
+        $email->action('Action Text', 'Action URL');
+
+        $this->assertSame([
+            'importance' => NotificationEmail::IMPORTANCE_LOW,
+            'content' => '',
+            'exception' => false,
+            'action_text' => 'Action Text',
+            'action_url' => 'Action URL',
+            'markdown' => false,
+            'raw' => false,
+            'footer_text' => 'Notification e-mail sent by Symfony',
+            'some' => 'context',
+            'foo' => 'bar',
+        ], $email->getContext());
+    }
 }