Monitor scale change and showFullScreen

Dear community,
I was playing today with the dprgadget from Qt sources, and I added a call to showFullscreen on the widget. I my opinion, if scale change even the window is already open, it should react and adapt to stay in full screen like almost every maximized window. 

int main(int argc, char **argv){  
QApplication app(argc, argv);  
DprGadget dprGadget;  
dprGadget.showFullScreen(); // We expect this size to be preserved across screen and DPI changes 
return app.exec(); }

EDIT: After investigation, replacing showFullscreen by this did the trick but it's kind of manual way

QObject::connect(windowHandle()->screen(), &QScreen::availableGeometryChanged, [=](){
            setGeometry(windowHandle()->screen()->geometry());
        });