"Edit" -> "Undo" lets Designer display wrong values

1. Open tests\manual\qml\testfiles_quick2\views.qml from Creator's source repository in Design mode.
2. Change anything in that file.
3. Select grid_view1.
4. Hit Ctrl+Z while looking at the Properties editor.
   The values for "Flick direction" and "Behavior" change.
5. Select some other item.
6. Select grid_view1.
   Properties editor displays the initial values again.

As grid_view1 was never changed at all, I don't see a reason why Designer should change the displayed values. The displayed values must be wrong before or after "Edit" -> "Undo".