List: Remove the inherited UList::shallowCopy to avoid accidental misuse

src/OpenFOAM/containers/Lists/List/List.H

@@ -208,6 +208,11 @@ public:
             //- Return subscript-checked element of UList.
             inline T& newElmt(const label);
 
+
+        //- Disallow implicit shallowCopy
+        void shallowCopy(const UList<T>&) = delete;
+
+
     // Member operators
 
         //- Assignment from UList operator. Takes linear time.

src/OpenFOAM/fields/GeometricFields/SlicedGeometricField/SlicedGeometricField.C

@@ -158,7 +158,7 @@ slicedBoundaryField
                     DimensionedField<Type, GeoMesh>::null()
                 )
             );
-            bf[patchi].shallowCopy(bField[patchi]);
+            bf[patchi].UList<Type>::shallowCopy(bField[patchi]);
         }
     }