Draft: Autogroup, insert guard to prevent cyclic references

ref. Forum discussion: Draft_OrthoArray: Crash when using active Std_Part. https://forum.freecadweb.org/viewtopic.php?f=23&t=59155&p=508132#p508132

Autogroup try to add new created Draft Objects into the active Part, but if the Part is used as a Base for the new object this could create a cyclic reference. 
This behaviour is prevented by adding a check for " obj in active_part.InListRecursive"

src/Mod/Draft/draftguitools/gui_edit_sketcher_objects.py

@@ -69,6 +69,7 @@ class SketcherSketchObjectGuiTools(GuiTools):
         0 : startpoint
         1 : endpoint
         """
+        import Sketcher
         if node_idx == 0:
             obj.movePoint(0, 1, v)
         elif node_idx == 1:

src/Mod/Draft/draftutils/gui_utils.py

@@ -129,6 +129,9 @@ def autogroup(obj):
         if Gui.ActiveDocument.ActiveView.getActiveObject("Arch"):
             # add object to active Arch Container
             active_arch_obj = Gui.ActiveDocument.ActiveView.getActiveObject("Arch")
+            if obj in active_arch_obj.InListRecursive:
+                # do not autogroup if obj points to active_arch_obj to prevent cyclic references
+                return
             active_arch_obj.addObject(obj)
 
         elif Gui.ActiveDocument.ActiveView.getActiveObject("part", False) is not None:
@@ -136,6 +139,9 @@ def autogroup(obj):
             # so object does not jump to different position, works with App::Link
             # if not scaled. Modified accordingly to realthunder suggestions
             active_part, parent, sub = Gui.ActiveDocument.ActiveView.getActiveObject("part", False)
+            if obj in active_part.InListRecursive:
+                # do not autogroup if obj points to active_part to prevent cyclic references
+                return
             matrix = parent.getSubObject(sub, retType=4)
             if matrix.hasScale() == 1:
                 err = translate("Draft",