Fix #492 -- Force deterministic ordering of some signals

src/pretix/control/views/event.py

@@ -674,7 +674,7 @@ class EventLive(EventPermissionRequiredMixin, TemplateView):
             issues.append(_('You need to configure at least one quota to sell anything.'))
 
         responses = event_live_issues.send(self.request.event)
-        for receiver, response in responses:
+        for receiver, response in sorted(responses, key=lambda r: str(r[0])):
             if response:
                 issues.append(response)
 

src/pretix/control/views/organizer.py

@@ -48,6 +48,7 @@ class OrganizerDetailViewMixin:
         for recv, retv in nav_organizer.send(sender=self.request.organizer, request=self.request,
                                              organizer=self.request.organizer):
             ctx['nav_organizer'] += retv
+        ctx['nav_organizer'].sort(key=lambda n: n['label'])
         return ctx
 
     def get_object(self, queryset=None) -> Organizer: