bug #48505 [Mailer] Fix rendered templates for notifications (fabpot)

This PR was merged into the 6.2 branch.

Discussion
----------

[Mailer] Fix rendered templates for notifications

| Q             | A
| ------------- | ---
| Branch?       | 6.2
| Bug fix?      | yes
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix #48472
| License       | MIT
| Doc PR        | n/a

Alternative to #48481

Commits
-------

085185de4d [Mailer] Fix rendered templates for notifications

Author: fabpot

Mime/BodyRenderer.php

@@ -59,15 +59,13 @@ public function render(Message $message): void
 
         if ($template = $message->getTextTemplate()) {
             $message->text($this->twig->render($template, $vars));
-            $message->textTemplate(null);
         }
 
         if ($template = $message->getHtmlTemplate()) {
             $message->html($this->twig->render($template, $vars));
-            $message->htmlTemplate(null);
         }
 
-        $message->context([]);
+        $message->markAsRendered();
 
         // if text body is empty, compute one from the HTML body
         if (!$message->getTextBody() && null !== $html = $message->getHtmlBody()) {

Mime/NotificationEmail.php

@@ -40,6 +40,7 @@ class NotificationEmail extends TemplatedEmail
         'raw' => false,
         'footer_text' => 'Notification e-mail sent by Symfony',
     ];
+    private bool $rendered = false;
 
     public function __construct(Headers $headers = null, AbstractPart $body = null)
     {
@@ -178,6 +179,18 @@ public function getContext(): array
         return array_merge($this->context, parent::getContext());
     }
 
+    public function isRendered(): bool
+    {
+        return $this->rendered;
+    }
+
+    public function markAsRendered(): void
+    {
+        parent::markAsRendered();
+
+        $this->rendered = true;
+    }
+
     public function getPreparedHeaders(): Headers
     {
         $headers = parent::getPreparedHeaders();
@@ -225,15 +238,17 @@ private function getExceptionAsString(\Throwable|FlattenException $exception): s
      */
     public function __serialize(): array
     {
-        return [$this->context, $this->theme, parent::__serialize()];
+        return [$this->context, $this->theme, $this->rendered, parent::__serialize()];
     }
 
     /**
      * @internal
      */
     public function __unserialize(array $data): void
     {
-        if (3 === \count($data)) {
+        if (4 === \count($data)) {
+            [$this->context, $this->theme, $this->rendered, $parentData] = $data;
+        } elseif (3 === \count($data)) {
             [$this->context, $this->theme, $parentData] = $data;
         } else {
             // Backwards compatibility for deserializing data structures that were serialized without the theme

Mime/TemplatedEmail.php

@@ -67,6 +67,18 @@ public function getContext(): array
         return $this->context;
     }
 
+    public function isRendered(): bool
+    {
+        return null === $this->htmlTemplate && null === $this->textTemplate;
+    }
+
+    public function markAsRendered(): void
+    {
+        $this->textTemplate = null;
+        $this->htmlTemplate = null;
+        $this->context = [];
+    }
+
     /**
      * @internal
      */