iOS: external Display isn't detected by QGuiApplication::screens()

Hi,

i am trying to get some information about an external display attached to an ios/android device.
Everything i tried works fine if i deploy for desktop. But android-,ios device and ios simulator are always reporting only one display/screen.

Also the signal QDesktopWidget::screenCountChanged() works fine for desktop target, but not for ios/android.

The external display is attached to the iOS-device via Lightning Digital AV Adapter; to the android-device via microUSB-to-hdmi (MHL) adapter cable.
In the iOS-simulator i can attach an external display via the "hardware" menu.

FYI: I already started a thread about this problem here:
http://qt-project.org/forums/viewthread/42774/

I attached a short example. Will add more if needed.