Check for mixed items in the cart AFTER processing delete requests. Fixes bug #12239.

docs/changelog/7.x.x.txt

@@ -4,6 +4,7 @@
  - fixed #12195: Visitor group by scratch membership shared among all Visitors (Dale Trexel)
  - fixed #12227: Corrected AssetReport such that OrderBy works correctly.
  - fixed #12238: Old template attachement in search template slows down sites
+ - fixed #12239: Still get cart error message after removing extra recurring items from the cart
 
 7.10.22
  - rfe   #12223: Add date type to content profiling (metadata)

lib/WebGUI/Shop/Cart.pm

@@ -758,17 +758,18 @@ sub updateFromForm {
             $item->update({shippingAddressId => $itemAddressId});
         }
     }
-    if ($self->hasMixedItems) {
-         my $i18n = WebGUI::International->new($self->session, "Shop");
-        $error{id $self} = $i18n->get('mixed items warning');
-    }
-
     my @cartItemIds = $form->process('remove_item', 'checkList');
     foreach my $cartItemId (@cartItemIds) {
         my $item = eval { $self->getItem($cartItemId); };
         $item->remove if ! Exception::Class->caught();
     }
 
+    ##Remove the items BEFORE we check to see if there are duplicates.
+    if ($self->hasMixedItems) {
+         my $i18n = WebGUI::International->new($self->session, "Shop");
+        $error{id $self} = $i18n->get('mixed items warning');
+    }
+
     ##Visitor cannot have an address book, or set a payment gateway, so skip the rest of this.
     return 1 if $session->user->isVisitor;