BUGFIX for duplacting slide

BUGFIX when duplicating slide an each composants, text into paragraph into richText where forget

Author: devX2712

src/PhpPresentation/Shape/RichText/Paragraph.php

@@ -107,7 +107,26 @@ public function __construct()
     }
 
     /**
-     * Get alignment.
+     * Magic Method : clone
+     */
+    public function __clone()
+    {
+      // Clone each text
+      if (isset($this->richTextElements)) {
+        foreach ($this->richTextElements as &$txtElt) {
+          $txtElt = clone $txtElt;
+      }}
+      // Clone each effect
+      if (isset($this->effectCollection)) {
+        foreach ($this->effectCollection as &$effect) {
+          $effect = clone $effect;
+      }}
+    }
+
+    /**
+     * Get alignment
+     *
+     * @return \PhpOffice\PhpPresentation\Style\Alignment
      */
     public function getAlignment(): Alignment
     {