Draft: fix issue with undo (#8267)

src/Mod/Draft/draftobjects/draftlink.py

@@ -181,6 +181,9 @@ class DraftLink(DraftObject):
             else:
                 self.execute(obj)
 
+        # Object properties are updated when the document is opened.
+        self.props_changed_clear()
+
     def buildShape(self, obj, pl, pls):
         """Build the shape of the link object."""
         if self.use_link:
@@ -229,6 +232,8 @@ class DraftLink(DraftObject):
 
     def onChanged(self, obj, prop):
         """Execute when a property changes."""
+        self.props_changed_store(prop)
+
         if not getattr(self, 'use_link', False):
             return