Add support for reserved seating (#1228)

* Initial work on seating

* Add seat guids

* Add product_list_top

* CartAdd: Ignore item when a seat is passed

* Cart display

* product_list_top → render_seating_plan

* Render seating plan in voucher redemption

* Fix failing tests

* Add tests for extending cart positions with seats

* Add subevent_forms to docs

* Update schema, migrations

* Dealing with expired orders

* steps to order change

* Change order positions

* Allow to add seats

* tests for ocm

* Fix things after rebase

* Seating plans API

* Add more tests for cart behaviour

* Widget support

* Adjust widget tests

* Re-enable CSP

* Update schema

* Api: position.seat

* Add guid to word list

* API: (sub)event.seating_plan

* Vali fixes

* Fix api

* Fix reference in test

* Fix test for real

src/pretix/control/logdisplay.py

@@ -42,6 +42,12 @@ def _display_order_changed(event: Event, logentry: LogEntry):
             old_price=money_filter(Decimal(data['old_price']), event.currency),
             new_price=money_filter(Decimal(data['new_price']), event.currency),
         )
+    elif logentry.action_type == 'pretix.event.order.changed.seat':
+        return text + ' ' + _('Position #{posid}: Seat "{old_seat}" changed '
+                              'to "{new_seat}".').format(
+            posid=data.get('positionid', '?'),
+            old_seat=data.get('old_seat'), new_seat=data.get('new_seat'),
+        )
     elif logentry.action_type == 'pretix.event.order.changed.subevent':
         old_se = str(event.subevents.get(pk=data['old_subevent']))
         new_se = str(event.subevents.get(pk=data['new_subevent']))