Arch: IFC exporter now exports cloned Arch objects with shared geometry

src/Mod/Arch/ArchCommands.py

@@ -649,7 +649,14 @@ def pruneIncluded(objectslist):
                     if parent.isDerivedFrom("Part::Feature"):
                         if not parent.isDerivedFrom("Part::Part2DObject"):
                             # don't consider 2D objects based on arch elements
-                            toplevel = False
+                            if hasattr(parent,"CloneOf"):
+                                if parent.CloneOf:
+                                    if parent.CloneOf.Name != obj.Name:
+                                        toplevel = False
+                                else:
+                                    toplevel = False
+                            else:
+                                toplevel = False
         if toplevel:
             newlist.append(obj)
     return newlist