From a1a1609b34110e5eb0bfc00891a16c31139be516 Mon Sep 17 00:00:00 2001
From: Fabien Potencier <fabien@potencier.org>
Date: Thu, 1 Sep 2022 20:18:29 +0200
Subject: [PATCH] [Mime] Fix TextPart broken after being serialized

---
 src/Symfony/Component/Mime/Part/TextPart.php           | 1 +
 src/Symfony/Component/Mime/Tests/Part/TextPartTest.php | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Symfony/Component/Mime/Part/TextPart.php b/src/Symfony/Component/Mime/Part/TextPart.php
index 4afb6560aec0..bfe41c0aab23 100644
--- a/src/Symfony/Component/Mime/Part/TextPart.php
+++ b/src/Symfony/Component/Mime/Part/TextPart.php
@@ -197,6 +197,7 @@ public function __sleep()
         // convert resources to strings for serialization
         if (null !== $this->seekable) {
             $this->body = $this->getBody();
+            $this->seekable = null;
         }
 
         $this->_headers = $this->getHeaders();
diff --git a/src/Symfony/Component/Mime/Tests/Part/TextPartTest.php b/src/Symfony/Component/Mime/Tests/Part/TextPartTest.php
index c3818b883d46..ea14fe29f88a 100644
--- a/src/Symfony/Component/Mime/Tests/Part/TextPartTest.php
+++ b/src/Symfony/Component/Mime/Tests/Part/TextPartTest.php
@@ -87,6 +87,8 @@ public function testSerialize()
         $p = new TextPart($r);
         $p->getHeaders()->addTextHeader('foo', 'bar');
         $expected = clone $p;
-        $this->assertEquals($expected->toString(), unserialize(serialize($p))->toString());
+        $n = unserialize(serialize($p));
+        $this->assertEquals($expected->toString(), $p->toString());
+        $this->assertEquals($expected->toString(), $n->toString());
     }
 }