fix: for several Shopping List bugs (#1912)

* prevent list refresh while re-ordering items

* update position of new items to stay at the bottom

* prevent refresh while loading

* copy item while editing so it isn't refreshed

* added loading count to handle overlapping actions

* fixed recipe reference throttling

* prevent merging checked and unchecked items

mealie/services/group_services/shopping_lists.py

@@ -28,6 +28,10 @@ class ShoppingListService:
         can_merge checks if the two items can be merged together.
         """
 
+        # Check if items are both checked or both unchecked
+        if item1.checked != item2.checked:
+            return False
+
         # Check if foods are equal
         foods_is_none = item1.food_id is None and item2.food_id is None
         foods_not_none = not foods_is_none