Property editor doesn't indicate explicitly set values for Text item

1. Open tests\manual\qml\testfiles_quick2\helloworld.qml from Creator's repository in Designer.
2. Select the Text item.
   The item's Position and Text properties are being highlighted in the Properties editor.
3. Close the file.
4. Open the file again.
5. Select the Text item.

There's no more highlighting in the Properties editor.

Explicitly set values should be highlighted in the Properties editor, no matter how often the file was opened and closed before.

comment from Thomas:
Something "funny" seems to happen and the property editor ends up in an invalid state if the document is closed.
Changing the selection once does fix this. We most likely have to deselect the item before closing the document.