1. Hold an iPad vertically, upside down, i.e. you look at the screen like you would look into a mirror and the main button is at the mirror's top edge.
   The OS will turn its visuals around so everything looks right for you.
2. Start a native app, e.g. Safari.
   The app will show up and have the right orientation from the start.
3. Start a Qt-based app.
   First, the app will grow to cover all the screen and then it will turn itself around so it looks right for you.
4. Now lay down the iPad on a table with the button facing away from you.
   Still the OS lets you clearly read all texts because it remembers the orientation.
5. Start a Qt-based app.
   It will start and from your point of view, everything will be upside down.

Qt-based apps should determine the right orientation just as native apps do.