Bump Django to 4.1.* (#2989)

src/pretix/control/forms/event.py

@@ -36,6 +36,7 @@
 
 from decimal import Decimal
 from urllib.parse import urlencode, urlparse
+from zoneinfo import ZoneInfo
 
 from django import forms
 from django.conf import settings
@@ -55,7 +56,7 @@ from django_countries.fields import LazyTypedChoiceField
 from i18nfield.forms import (
     I18nForm, I18nFormField, I18nFormSetMixin, I18nTextarea, I18nTextInput,
 )
-from pytz import common_timezones, timezone
+from pytz import common_timezones
 
 from pretix.base.channels import get_all_sales_channels
 from pretix.base.email import get_available_placeholders
@@ -221,7 +222,7 @@ class EventWizardBasicsForm(I18nModelForm):
             })
 
         # change timezone
-        zone = timezone(data.get('timezone'))
+        zone = ZoneInfo(data.get('timezone'))
         data['date_from'] = self.reset_timezone(zone, data.get('date_from'))
         data['date_to'] = self.reset_timezone(zone, data.get('date_to'))
         data['presale_start'] = self.reset_timezone(zone, data.get('presale_start'))
@@ -230,7 +231,7 @@ class EventWizardBasicsForm(I18nModelForm):
 
     @staticmethod
     def reset_timezone(tz, dt):
-        return tz.localize(dt.replace(tzinfo=None)) if dt is not None else None
+        return dt.replace(tzinfo=tz) if dt is not None else None
 
     def clean_slug(self):
         slug = self.cleaned_data['slug']

src/pretix/control/forms/item.py

@@ -747,7 +747,7 @@ class ItemVariationsFormSet(I18nFormSet):
 
     def _should_delete_form(self, form):
         should_delete = super()._should_delete_form(form)
-        if should_delete and (form.instance.orderposition_set.exists() or form.instance.cartposition_set.exists()):
+        if should_delete and form.instance.pk and (form.instance.orderposition_set.exists() or form.instance.cartposition_set.exists()):
             form._delete_fail = True
             return False
         return form.cleaned_data.get(DELETION_FIELD_NAME, False)

src/pretix/control/forms/organizer.py

@@ -602,7 +602,7 @@ class WebHookForm(forms.ModelForm):
                 mark_safe('{} – <code>{}</code>'.format(a.verbose_name, a.action_type))
             ) for a in get_all_webhook_events().values()
         ]
-        if self.instance:
+        if self.instance and self.instance.pk:
             self.fields['events'].initial = list(self.instance.listeners.values_list('action_type', flat=True))
 
     class Meta:

src/pretix/control/forms/renderers.py

@@ -19,7 +19,6 @@
 # You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
 # <https://www.gnu.org/licenses/>.
 #
-from bootstrap3.renderers import FieldRenderer, InlineFieldRenderer
 from bootstrap3.text import text_value
 from django.forms import CheckboxInput
 from django.forms.utils import flatatt
@@ -28,6 +27,8 @@ from django.utils.safestring import mark_safe
 from django.utils.translation import pgettext
 from i18nfield.forms import I18nFormField
 
+from pretix.base.forms.renderers import FieldRenderer, InlineFieldRenderer
+
 
 def render_label(content, label_for=None, label_class=None, label_title='', optional=False):
     """