Arch: small bugfixes and optimisations

src/Mod/Arch/ArchWindow.py

@@ -682,9 +682,7 @@ class _Window(ArchComponent.Component):
                         print "Arch: Bad formatting of window parts definitions"
                             
         base = self.processSubShapes(obj,base)
-        if base:
-            if not base.isNull():
-                obj.Shape = base
+        self.applyShape(obj,base,pl)
 
     def getSubVolume(self,obj,plac=None):
         "returns a subvolume for cutting in a base object"