Added dispatch_uid argument to all receivers to prevent duplicate

execution

src/pretix/plugins/banktransfer/signals.py

@@ -8,12 +8,12 @@ from pretix.control.signals import nav_event
 from .payment import BankTransfer
 
 
-@receiver(register_payment_providers)
+@receiver(register_payment_providers, dispatch_uid="payment_banktransfer")
 def register_payment_provider(sender, **kwargs):
     return BankTransfer
 
 
-@receiver(nav_event)
+@receiver(nav_event, dispatch_uid="payment_banktransfer_nav")
 def control_nav_import(sender, request=None, **kwargs):
     url = resolve(request.path_info)
     if not request.eventperm.can_change_orders:

src/pretix/plugins/paypal/signals.py

@@ -3,7 +3,7 @@ from django.dispatch import receiver
 from pretix.base.signals import register_payment_providers
 
 
-@receiver(register_payment_providers)
+@receiver(register_payment_providers, dispatch_uid="payment_paypal")
 def register_payment_provider(sender, **kwargs):
     from .payment import Paypal
     return Paypal

src/pretix/plugins/sendmail/signals.py

@@ -5,7 +5,7 @@ from django.utils.translation import ugettext_lazy as _
 from pretix.control.signals import nav_event
 
 
-@receiver(nav_event)
+@receiver(nav_event, dispatch_uid="sendmail_nav")
 def control_nav_import(sender, request=None, **kwargs):
     url = resolve(request.path_info)
     if not request.eventperm.can_change_orders:

src/pretix/plugins/stripe/signals.py

@@ -7,14 +7,14 @@ from pretix.base.signals import register_payment_providers
 from pretix.presale.signals import html_head
 
 
-@receiver(register_payment_providers)
+@receiver(register_payment_providers, dispatch_uid="payment_stripe")
 def register_payment_provider(sender, **kwargs):
     from .payment import Stripe
 
     return Stripe
 
 
-@receiver(html_head)
+@receiver(html_head, dispatch_uid="payment_stripe_html_head")
 def html_head_presale(sender, request=None, **kwargs):
     from .payment import Stripe
 

src/pretix/plugins/ticketoutputpdf/signals.py

@@ -3,7 +3,7 @@ from django.dispatch import receiver
 from pretix.base.signals import register_ticket_outputs
 
 
-@receiver(register_ticket_outputs)
+@receiver(register_ticket_outputs, dispatch_uid="output_pdf")
 def register_ticket_outputs(sender, **kwargs):
     from .ticketoutput import PdfTicketOutput
     return PdfTicketOutput

src/pretix/plugins/timerestriction/signals.py

@@ -21,7 +21,7 @@ def timediff(restrictions):
             yield (r.timeframe_to - now()).total_seconds()
 
 
-@receiver(determine_availability)
+@receiver(determine_availability, dispatch_uid="restriction_time")
 def availability_handler(sender, **kwargs):
     # Handle the signal's input arguments
     item = kwargs['item']
@@ -131,7 +131,7 @@ class TimeRestrictionForm(RestrictionForm):
         ]
 
 
-@receiver(restriction_formset)
+@receiver(restriction_formset, dispatch_uid="restriction_time_formset")
 def formset_handler(sender, **kwargs):
     formset = inlineformset_factory(
         Item,