Deal with cancelling memberships (#2130)

src/pretix/presale/checkoutflow.py

@@ -376,6 +376,7 @@ class MembershipStep(QuestionsViewMixin, CartMixin, TemplateFlowStep):
 
         memberships = list(self.cart_customer.memberships.with_usages().filter(
             Q(Q(membership_type__max_usages__isnull=True) | Q(usages__lt=F('membership_type__max_usages'))),
+            canceled=False
         ).select_related('membership_type'))
 
         for p in self.applicable_positions:

src/pretix/presale/templates/pretixpresale/organizers/customer_profile.html

@@ -58,7 +58,9 @@
             {% for m in memberships %}
                 <tr>
                     <td>
+                        {% if m.canceled %}<del>{% endif %}
                         {{ m.membership_type.name }}
+                        {% if m.canceled %}</del>{% endif %}
                         {% if m.testmode %}<span class="label label-warning">{% trans "TEST MODE" %}</span>{% endif %}
                     </td>
                     <td>