[REG: Qt 5.4 -> 5.5][iOS 7] UIActivityViewController causes the Application to go out of view

1) Run the attached sample
2) Hit the push button
3) Hit cancel on the UIActivityViewController window that pops up
4) You will notice that when the view goes away, the main window will offset itself and no longer be on screen.

The issue can be only reproduced on iOS 7.