Fullscreen application doesn't stay on top
I have a fullscreen application, based upon qtquick2applicationviewer. At start it occupies the whole screen.
When requested it launches an external Qt application, fullscreen too. When finished the latter hides itself and in the qml I raise the last page (z = 1) and set the focus = true.
But I see the gnome3 upper bar! After I click inside the window it returns in fullscreen mode.
How to avoid that?
Thanks in advance