Cannot reset value of "minimumHeight"

1. Create a new Qt Quick Application project using Quick Controls 1.2.
2. Open its QML file in Design mode.
3. Select the ApplicationWindow item.
4. In the Properties view, change the value for minimumHeight.
5. Click on the the small arrow on the left of the spin box and select "Reset" from the popup menu.
   The value will not be reset in the Properties view.
6. Go to Edit mode.
   minimumHeight was reset in the QML file.
7. Go to Design mode.
8. Select the ApplicationWindow item.
9. In the Properties view, see the value for minimumHeight.
   It still shows the same value as entered in step 4.
10. Close the project and all editors.
11. Create another Qt Quick Application project using Quick Controls 1.2.
12. Open its QML file in Edit mode.
    See that there is no value set for minimumHeight.
13. Open its QML file in Design mode.
14. Select the ApplicationWindow item.
15. In the Properties view, see the value for minimumHeight.
    It still shows the same value as entered in step 4.

"Reset" should reset the value. When opening new files, the Designer should use the values from this file and not from one that was opened before.