Render markdown in all e-mail previews

src/pretix/control/templates/pretixcontrol/order/sendmail.html

@@ -22,13 +22,10 @@
                 <fieldset>
                     <legend>{% trans "E-mail preview" %}</legend>
                     <div class="tab-pane mail-preview-group">
-                        <pre lang="" class="mail-preview">
-                            {% for segment in preview_output %}
-                                {% spaceless %}
-                                    {{ segment|linebreaksbr }}
-                                {% endspaceless %}
-                            {% endfor %}
-                        </pre>
+                        <div lang="{{ order.locale }}" class="mail-preview">
+                            <strong>{{ preview_output.subject }}</strong><br><br>
+                            {{ preview_output.html|safe }}
+                        </div>
                     </div>
                 </fieldset>
             {% endif %}

src/pretix/control/views/orders.py

@@ -60,6 +60,7 @@ from pretix.base.signals import (
     register_data_exporters, register_ticket_outputs,
 )
 from pretix.base.templatetags.money import money_filter
+from pretix.base.templatetags.rich_text import markdown_compile_email
 from pretix.base.views.mixins import OrderQuestionsViewMixin
 from pretix.base.views.tasks import AsyncAction
 from pretix.control.forms.filter import EventOrderFilterForm, RefundFilterForm
@@ -1483,10 +1484,10 @@ class OrderSendMail(EventPermissionRequiredMixin, OrderViewMixin, FormView):
         email_template = LazyI18nString(form.cleaned_data['message'])
         email_content = render_mail(email_template, email_context)
         if self.request.POST.get('action') == 'preview':
-            self.preview_output = []
-            self.preview_output.append(
-                _('Subject: {subject}').format(subject=form.cleaned_data['subject']))
-            self.preview_output.append(email_content)
+            self.preview_output = {
+                'subject': _('Subject: {subject}').format(subject=form.cleaned_data['subject']),
+                'html': markdown_compile_email(email_content)
+            }
             return self.get(self.request, *self.args, **self.kwargs)
         else:
             try: