I am using QDataWidgetMapper successfully with QLineEdit and other widgets but it doesn't work with QCombobox.

If I replace the QCombobox by a QLineEdit, it works: the QLineEdit is updated when I select a line in my table view.
If I come back to the QCombobox, it doesn't work: the QCombobox is not updated when I select a line in my table view.

Do you know why ?
Is it normal or is it a bug ?
Do you know a simple workaround ?

Thank you for your help