Restore ViewObject implementation for all Draft objects

In my tests the code works fine. Using @AIRCAP's instructions,  I have created a 'broken' file from draft_test_objects.FCStd.

src/Mod/Draft/draftobjects/shape2dview.py

@@ -31,12 +31,11 @@ from PySide.QtCore import QT_TRANSLATE_NOOP
 
 import FreeCAD as App
 import DraftVecUtils
-import draftutils.utils as utils
-import draftutils.gui_utils as gui_utils
-import draftutils.groups as groups
-
-from draftutils.translate import translate
 from draftobjects.base import DraftObject
+from draftutils import groups
+from draftutils import gui_utils
+from draftutils import utils
+from draftutils.translate import translate
 
 
 class Shape2DView(DraftObject):
@@ -45,7 +44,14 @@ class Shape2DView(DraftObject):
     def __init__(self,obj):
 
         self.setProperties(obj)
-        super(Shape2DView, self).__init__(obj, "Shape2DView")
+        super().__init__(obj, "Shape2DView")
+
+    def onDocumentRestored(self, obj):
+        self.setProperties(obj)
+        super().onDocumentRestored(obj)
+        gui_utils.restore_view_object(
+            obj, vp_module="view_base", vp_class="ViewProviderDraftAlt", format=False
+        )
 
     def setProperties(self,obj):
 
@@ -136,10 +142,6 @@ class Shape2DView(DraftObject):
                             "Draft", _tip)
             obj.AutoUpdate = True
 
-    def onDocumentRestored(self, obj):
-
-        self.setProperties(obj)
-
     def getProjected(self,obj,shape,direction):
 
         "returns projected edges from a shape and a direction"