iOS IAA bug

void handleInterAppAudioConnectionChange()
call audioDeviceAboutToStart when connected, but it doesnt call callback->audioDeviceStopped() when IAA is disconnected. So there is no way of knowing the IAA was disconnected.

https://github.com/WeAreROLI/JUCE/commit/de181762d2a5d8df55cc19898374ea320f85c186

Thanks!