Update address field logic (Z#23163120) (#4659)

* Move country-dependent JS logic to separate file (avoids code duplication for presale and control)
* Correctly apply "required" attribute to address state field
* Load address format information when selecting country
* Fix some other bugs and inconsistencies

src/pretix/presale/checkoutflow.py

@@ -1076,8 +1076,8 @@ class QuestionsStep(QuestionsViewMixin, CartMixin, TemplateFlowStep):
                     if warn:
                         messages.warning(request, _('Please fill in answers to all required questions.'))
                     return False
-                if cp.item.ask_attendee_data and self.request.event.settings.get('attendee_attendees_required', as_type=bool) \
-                        and (cp.street is None or cp.city is None or cp.country is None):
+                if cp.item.ask_attendee_data and self.request.event.settings.get('attendee_addresses_required', as_type=bool) \
+                        and (cp.street is None and cp.city is None and cp.country is None):
                     if warn:
                         messages.warning(request, _('Please fill in answers to all required questions.'))
                     return False

src/pretix/presale/templates/pretixpresale/fragment_js.html

@@ -20,4 +20,5 @@
     <script type="text/javascript" src="{% static "pretixpresale/js/ui/cart.js" %}"></script>
     <script type="text/javascript" src="{% static "lightbox/js/lightbox.js" %}"></script>
     <script type="text/javascript" src="{% static "pretixpresale/js/ui/iframe.js" %}"></script>
+    <script type="text/javascript" src="{% static "pretixbase/js/addressform.js" %}"></script>
 {% endcompress %}