fixup! Movement: Add isMovingItem method to be possible check if the object is...

fixup! Movement: Add isMovingItem method to be possible check if the object is moving physically or not

Delivery Cell follow the same logic as Deliver Line to decide if a
movement is moving item. There is no "Delivery Movement" class yet, so I
duplicate the method for now.

Without this fix, item tracking no longer work when using variations.

product/ERP5/Document/DeliveryCell.py

@@ -160,6 +160,14 @@ class DeliveryCell(MappedValue, Movement, ImmobilisationMovement):
     def isMovement(self):
       return 1
 
+    security.declareProtected(Permissions.AccessContentsInformation,
+                             'isMovingItem')
+    def isMovingItem(self, item):
+      type_based_script = self._getTypeBasedMethod('isMovingItem')
+      if type_based_script:
+        return type_based_script(item)
+      return self.isAccountable()
+
     # Override getQuantityUnitXXX to negate same methods defined in
     # Amount class. Because cell must acquire quantity unit from line
     # not from resource.