[Mime] Simplify code

Author: fabpot

Email.php

@@ -501,16 +501,11 @@ private function prepareParts(): ?array
             $names = array_filter(array_unique($names));
         }
 
-        // usage of reflection is a temporary workaround for missing getters that will be added in 6.2
-        $dispositionRef = new \ReflectionProperty(TextPart::class, 'disposition');
-        $dispositionRef->setAccessible(true);
-        $nameRef = new \ReflectionProperty(TextPart::class, 'name');
-        $nameRef->setAccessible(true);
         $attachmentParts = $inlineParts = [];
         foreach ($this->attachments as $attachment) {
             $part = $this->createDataPart($attachment);
             if (isset($attachment['part'])) {
-                $attachment['name'] = $nameRef->getValue($part);
+                $attachment['name'] = $part->getName();
             }
 
             foreach ($names as $name) {
@@ -527,7 +522,7 @@ private function prepareParts(): ?array
                 break;
             }
 
-            if ('inline' === $dispositionRef->getValue($part)) {
+            if ('inline' === $part->getDisposition()) {
                 $inlineParts[$attachment['name']] = $part;
             } else {
                 $attachmentParts[] = $part;

Part/TextPart.php

@@ -89,6 +89,11 @@ public function setDisposition(string $disposition): static
         return $this;
     }
 
+    public function getDisposition(): ?string
+    {
+        return $this->disposition;
+    }
+
     /**
      * Sets the name of the file (used by FormDataPart).
      *
@@ -102,7 +107,7 @@ public function setName(string $name): static
     }
 
     /**
-     * Gets the name of the file (used by FormDataPart).
+     * Gets the name of the file.
      */
     public function getName(): ?string
     {