Draft: fix ScaleMultiplier on annotation objects

Object auto create the property when opening an old Draft annotation
.

src/Mod/Draft/draftobjects/draft_annotation.py

@@ -20,7 +20,6 @@
 # *   USA                                                                   *
 # *                                                                         *
 # ***************************************************************************
-
 """This module provides the object code for Draft Annotation.
 """
 ## @package annotation
@@ -32,9 +31,15 @@ from PySide.QtCore import QT_TRANSLATE_NOOP
 from draftutils import gui_utils
 
 class DraftAnnotation(object):
-    """The Draft Annotation Base object
-    This class is not used directly, but inherited by all annotation
+    """The Draft Annotation Base object.
+
+    This class is not used directly, but inherited by all Draft annotation
     objects.
+    
+    LinearDimension through DimensionBase
+    AngularDimension through DimensionBase
+    Label
+    Text
     """
     def __init__(self, obj, tp="Annotation"):
         """Add general Annotation properties to the object"""
@@ -42,6 +47,19 @@ class DraftAnnotation(object):
         self.Type = tp
 
 
+    def onDocumentRestored(self, obj):
+        '''Check if new properties are present after object is recreated.'''
+        if hasattr(obj, "ViewObject") and obj.ViewObject:
+            if not 'ScaleMultiplier' in obj.ViewObject.PropertiesList:
+                # annotation properties
+                _msg = QT_TRANSLATE_NOOP("Draft", 
+                                         "Adding property ScaleMultiplier to ")
+                App.Console.PrintMessage(_msg + obj.Name + "\n")
+                obj.ViewObject.addProperty("App::PropertyFloat","ScaleMultiplier",
+                                "Annotation",QT_TRANSLATE_NOOP("App::Property",
+                                "Dimension size overall multiplier"))
+                obj.ViewObject.ScaleMultiplier = 1.00
+
     def __getstate__(self):
         return self.Type