setWindowModified(true) does not propagate to parents

According to the docs calling QWidget::setWindowModified( true ) should cause the event to be propagated up to the top-level parent widget.

Instead, the widget on which the above call is made makes a useless check to see if it's windowTitle() contains "[*]" which is very unlikely for a child widget. The function then does indeed create a QEvent with type() == ModifiedChange and sends the event.

The event is correctly passed over to the QWidget::changeEvent() function but this function does not correctly handle it. I think that it should check to see if this is a top-level window and then set the title if so. Or if it is not a top-level window propagate the event up to the parent widget and so on.

More info can be found at http://developer.qt.nokia.com/forums/viewthread/7176/