Fix booked add-ons being hidden in order change due to hide_sold_out

src/pretix/presale/views/event.py

@@ -101,7 +101,8 @@ def item_group_by_category(items):
 
 
 def get_grouped_items(event, subevent=None, voucher=None, channel='web', require_seat=0, base_qs=None, allow_addons=False,
-                      quota_cache=None, filter_items=None, filter_categories=None, memberships=None):
+                      quota_cache=None, filter_items=None, filter_categories=None, memberships=None,
+                      ignore_hide_sold_out_for_item_ids=None):
     base_qs_set = base_qs is not None
     base_qs = base_qs if base_qs is not None else event.items
 
@@ -273,7 +274,9 @@ def get_grouped_items(event, subevent=None, voucher=None, channel='web', require
                     item.check_quotas(subevent=subevent, _cache=quota_cache, include_bundled=True)
                 )
 
-            if event.settings.hide_sold_out and item.cached_availability[0] < Quota.AVAILABILITY_RESERVED:
+            if not (
+                    ignore_hide_sold_out_for_item_ids and item.pk in ignore_hide_sold_out_for_item_ids
+            ) and event.settings.hide_sold_out and item.cached_availability[0] < Quota.AVAILABILITY_RESERVED:
                 item._remove = True
                 continue
 
@@ -359,7 +362,7 @@ def get_grouped_items(event, subevent=None, voucher=None, channel='web', require
                 ) and not getattr(v, '_remove', False)
             ]
 
-            if event.settings.hide_sold_out:
+            if not (ignore_hide_sold_out_for_item_ids and item.pk in ignore_hide_sold_out_for_item_ids) and event.settings.hide_sold_out:
                 item.available_variations = [v for v in item.available_variations
                                              if v.cached_availability[0] >= Quota.AVAILABILITY_RESERVED]
 

src/pretix/presale/views/order.py

@@ -1238,6 +1238,7 @@ class OrderChange(EventViewMixin, OrderDetailMixin, TemplateView):
                                 )
                                 if self.order.customer else None
                             ),
+                            ignore_hide_sold_out_for_item_ids={k[0] for k in current_addon_products.keys()}
                         )
                         item_cache[ckey] = items
                     else:

src/tests/presale/test_order_change.py

@@ -818,6 +818,30 @@ class OrderChangeAddonsTest(BaseOrdersTest):
         with scopes_disabled():
             assert self.ticket_pos.addons.count() == 0
 
+    def test_quota_hide_sold_out_do_not_hide_initial(self):
+        self.event.settings.hide_sold_out = True
+        self.workshopquota.size = 1
+        self.workshopquota.save()
+
+        with scopes_disabled():
+            OrderPosition.objects.create(
+                order=self.order,
+                item=self.workshop1,
+                variation=None,
+                price=Decimal("12"),
+                addon_to=self.ticket_pos,
+                attendee_name_parts={'full_name': "Peter"}
+            )
+            self.order.total += Decimal("12")
+            self.order.save()
+
+        response = self.client.get(
+            '/%s/%s/order/%s/%s/change' % (self.orga.slug, self.event.slug, self.order.code, self.order.secret)
+        )
+        assert response.status_code == 200
+        assert 'Workshop 1' in response.content.decode()
+        assert 'Workshop 2' not in response.content.decode()
+
     def test_quota_sold_out_replace(self):
         self.workshopquota.size = 1
         self.workshopquota.save()