Qdoc ignores the fact that a QML property is readonly

As C++ class that is documented as a QML type, with the "\instantiates C+Class" line pointing the C++ implementation, is sufficient hint for Qdoc to verify if the QML property is readonly or not. Apparently, the following properties of the Flickable type are readonly but their documentation does not include this info.:

• Flickable.dragging
• Flickable.dragginHorizontally
• Flickable.dragginVertically
• Flickable.moving
• Flickable.movingHorizontally
• Flickable.movingVertically
• Flickable.flicking
• Flickable.flickingHorizontally
• Flickable.flickinggVertically