Remove back link from 404 error page (#23222967)

I've kept it for 400/403/500/csrffail for now, because they also have a
"try again" link. Yes, both things have browser buttons, but they make
it a *little* clearer to technical users what one could to next, and
especially on csrffail, "step back" is always possible and possibly actually
helpful.

src/pretix/base/services/mail.py

@@ -409,18 +409,6 @@ def mail_send_task(self, **kwargs) -> bool:
         outgoing_mail.inflight_since = now()
         outgoing_mail.save(update_fields=["status", "inflight_since"])
 
-    # Performance optimization, saves database queries later on if we resolve the known relationships
-    if outgoing_mail.event_id:
-        assert outgoing_mail.event.organizer_id == outgoing_mail.organizer.pk
-        outgoing_mail.event.organizer = outgoing_mail.organizer
-    if outgoing_mail.order_id:
-        assert outgoing_mail.order.event_id == outgoing_mail.event_id
-        outgoing_mail.order.event = outgoing_mail.event
-        outgoing_mail.order.organizer = outgoing_mail.organizer
-    if outgoing_mail.orderposition_id:
-        assert outgoing_mail.orderposition.order_id == outgoing_mail.order_id
-        outgoing_mail.orderposition.order = outgoing_mail.order
-
     headers = dict(outgoing_mail.headers)
     headers.setdefault('X-PX-Correlation', str(outgoing_mail.guid))
     email = CustomEmail(

src/pretix/base/services/placeholders.py

@@ -24,7 +24,6 @@ import logging
 from datetime import timedelta
 from decimal import Decimal
 
-from django.db.models import Prefetch, prefetch_related_objects
 from django.dispatch import receiver
 from django.utils.formats import date_format
 from django.utils.html import escape, mark_safe
@@ -36,7 +35,6 @@ from pretix.base.forms.widgets import format_placeholders_help_text
 from pretix.base.i18n import (
     LazyCurrencyNumber, LazyDate, LazyExpiresDate, LazyNumber,
 )
-from pretix.base.models import EventMetaValue
 from pretix.base.reldate import RelativeDateWrapper
 from pretix.base.settings import PERSON_NAME_SCHEMES, get_name_parts_localized
 from pretix.base.signals import (
@@ -754,11 +752,6 @@ def base_placeholders(sender, **kwargs):
             name_scheme['sample'][f]
         ))
 
-    prefetch_related_objects(
-        [sender],
-        Prefetch('meta_values', queryset=EventMetaValue.objects.select_related("property"), to_attr="meta_values_cached")
-    )
-    prefetch_related_objects([sender.organizer], Prefetch('meta_properties'))
     for k, v in sender.meta_data.items():
         ph.append(MarkdownTextPlaceholder(
             'meta_%s' % k, ['event'], lambda event, k=k: event.meta_data[k],

src/pretix/base/templates/404.html

@@ -8,9 +8,6 @@
         <h1>{% trans "Not found" %}</h1>
         <p>{% trans "I'm afraid we could not find the the resource you requested." %}</p>
         <p>{{ exception }}</p>
-        <p class="links">
-            <a id='goback' href='#'>{% trans "Take a step back" %}</a>
-        </p>
         {% if request.user.is_staff and not staff_session %}
             <form action="{% url 'control:user.sudo' %}?next={{ request.path|add:"?"|add:request.GET.urlencode|urlencode }}" method="post">
                 <p>

src/pretix/presale/templates/pretixpresale/event/resend_link.html

@@ -1,14 +1,14 @@
 {% extends "pretixpresale/event/base.html" %}
 {% load i18n %}
 {% load bootstrap3 %}
-{% block title %}{% trans "Resend order links" %}{% endblock %}
+{% block title %}{% trans "Resend order link" %}{% endblock %}
 {% block custom_header %}
     {{ block.super }}
     <meta name="robots" content="noindex, nofollow">
 {% endblock %}
 {% block content %}
     <h2>
-        {% trans "Resend order links" %}
+        {% trans "Resend order link" %}
     </h2>
     <p>
         {% blocktrans trimmed %}

src/pretix/presale/views/order.py

@@ -1510,7 +1510,10 @@ class OrderChangeMixin:
                             'max_count': iao.max_count,
                             'iao': iao,
                             'items': [i for i in items if not i.require_voucher],
-                            'items_missing': {k: v for k, v in current_addon_products_missing.items() if v},
+                            'items_missing': {
+                                k: v for k, v in current_addon_products_missing.items()
+                                if v and k[0].category_id == iao.addon_category_id
+                            },
                         })
 
         return positions