Widget: Allow to call subevents by URL isntead of attribute

src/pretix/presale/views/widget.py

@@ -682,6 +682,8 @@ class WidgetAPIProductList(EventListMixin, View):
                 return self.response(cached_data)
 
         data = {
+            'target_url': build_absolute_uri(request.event, 'presale:event.index'),
+            'subevent': self.subevent.pk if self.subevent else None,
             'currency': request.event.currency,
             'display_net_prices': request.event.settings.display_net_prices,
             'use_native_spinners': request.event.settings.widget_use_native_spinners,

src/pretix/static/pretixpresale/js/widget/widget.js

@@ -1739,6 +1739,10 @@ var shared_root_methods = {
                 root.meta_filter_fields = data.meta_filter_fields;
             } else {
                 root.view = "event";
+                // Replace target_url and subevent with canonical values in case they were slightly wrong
+                root.target_url = data.target_url;
+                root.subevent = data.subevent;
+                // Event data
                 root.name = data.name;
                 root.frontpage_text = data.frontpage_text;
                 root.date_range = data.date_range;