Fix #492 -- Force deterministic ordering of some signals

src/pretix/control/context.py

@@ -45,12 +45,12 @@ def contextprocessor(request):
     if not hasattr(request, 'event'):
         for receiver, response in nav_global.send(request, request=request):
             _nav_global += response
-    ctx['nav_global'] = _nav_global
+    ctx['nav_global'] = sorted(_nav_global, key=lambda n: n['label'])
 
     _nav_topbar = []
     for receiver, response in nav_topbar.send(request, request=request):
         _nav_topbar += response
-    ctx['nav_topbar'] = _nav_topbar
+    ctx['nav_topbar'] = sorted(_nav_topbar, key=lambda n: n['label'])
 
     ctx['js_datetime_format'] = get_javascript_format('DATETIME_INPUT_FORMATS')
     ctx['js_date_format'] = get_javascript_format('DATE_INPUT_FORMATS')

src/pretix/control/forms/global_settings.py

@@ -29,7 +29,7 @@ class GlobalSettingsForm(SettingsForm):
             ))
         ])
         responses = register_global_settings.send(self)
-        for r, response in responses:
+        for r, response in sorted(responses, key=lambda r: str(r[0])):
             for key, value in response.items():
                 # We need to be this explicit, since OrderedDict.update does not retain ordering
                 self.fields[key] = value

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: