bug #39866 [Mime] Escape commas in address names (YaFou)

This PR was merged into the 4.4 branch.

Discussion
----------

[Mime] Escape commas in address names

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #39416
| License       | MIT
| Doc PR        | --
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Before:
```php
$address = new Address('[email protected]', 'Fabien, Potencier');
$address->toString(); // Fabien, Potencier <[email protected]> -> Interpreted like two emails
```

After:
```php
$address = new Address('[email protected]', 'Fabien, Potencier');
$address->toString(); // "Fabien, Potencier" <[email protected]>
```

Commits
-------

39e9158999 [Mime] Escape commas in address names

Author: fabpot

Address.php

@@ -78,7 +78,16 @@ public function getEncodedAddress(): string
 
     public function toString(): string
     {
-        return ($n = $this->getName()) ? $n.' <'.$this->getEncodedAddress().'>' : $this->getEncodedAddress();
+        return ($n = $this->getEncodedName()) ? $n.' <'.$this->getEncodedAddress().'>' : $this->getEncodedAddress();
+    }
+
+    public function getEncodedName(): string
+    {
+        if ('' === $this->getName()) {
+            return '';
+        }
+
+        return sprintf('"%s"', preg_replace('/"/u', '\"', $this->getName()));
     }
 
     /**

Tests/AddressTest.php

@@ -27,7 +27,7 @@ public function testConstructor()
         $a = new Address('fabien@symfonï.com', 'Fabien');
         $this->assertEquals('Fabien', $a->getName());
         $this->assertEquals('fabien@symfonï.com', $a->getAddress());
-        $this->assertEquals('Fabien <[email protected]>', $a->toString());
+        $this->assertEquals('"Fabien" <[email protected]>', $a->toString());
         $this->assertEquals('[email protected]', $a->getEncodedAddress());
     }
 
@@ -153,4 +153,10 @@ public function fromStringProvider()
             ],
         ];
     }
+
+    public function testEncodeNameIfNameContainsCommas()
+    {
+        $address = new Address('[email protected]', 'Fabien, "Potencier');
+        $this->assertSame('"Fabien, \"Potencier" <[email protected]>', $address->toString());
+    }
 }