Added alternative mail formats view

Added a foreach on swiftmailer message parts to display also the alternate text/html text/plain version of the message.

Author: alex88

Resources/views/Collector/swiftmailer.html.twig

@@ -54,6 +54,18 @@
                     {%- endif -%}
                 </pre>
             </p>
+            {% for messagePart in message.children if messagePart.contentType == 'text/plain' or messagePart.contentType == 'text/html' %}
+                <h4>Alternative part</h4>
+                <p>
+                    <pre>
+                        {%- if messagePart.charset %}
+                            {{- messagePart.body|e('html', messagePart.charset)|convert_encoding('UTF-8', messagePart.charset) }}
+                        {%- else %}
+                            {{- messagePart.body|e('html') }}
+                        {%- endif -%}
+                    </pre>
+                </p>
+            {% endfor %}
         {% endfor %}
     {% endif %}
 {% endblock %}