Draft: Fix clone of art object

src/Mod/Draft/Draft.py

@@ -2712,7 +2712,8 @@ def clone(obj,delta=None):
             pass
         return cl
     else:
-        cl = FreeCAD.ActiveDocument.addObject("Part::AttachableObjectPython","Clone")
+        cl = FreeCAD.ActiveDocument.addObject("Part::FeaturePython","Clone")
+        cl.addExtension("Part::AttachExtensionPython", None)
         cl.Label = prefix + obj[0].Label
     _Clone(cl)
     if gui:

src/Mod/Draft/TestDraft.py

@@ -132,6 +132,12 @@ class DraftTest(unittest.TestCase):
         r2 = Draft.offset(r,FreeCAD.Vector(-1,-1,0),copy=True)
         self.failUnless(r2,"Draft Offset failed")
 
+    def testCloneOfPart(self):
+        #test for a bug introduced by changes attachment code
+        box = FreeCAD.ActiveDocument.addObject("Part::Box", "Box")
+        clone = Draft.clone(box)
+        self.failUnless(clone.hasExtension("Part::AttachExtension"))
+
     # modification tools
 
     def tearDown(self):