Mouse input from QWindow with Qt::WindowTransparentForInput set is forwarded with wrong coords when embedded in a widget.

int main(int argc, char *argv[])
{
   QApplication a(argc, argv);
   QWidget w;
   w.setFixedSize(300, 50);
   auto menubar = new QMenuBar;
   menubar->addAction("Foo");
   menubar->addAction("Bar");
   menubar->addAction("Bazz");
   auto win = new QWindow();
   win->setFlag(Qt::WindowTransparentForInput);
   auto container = QWidget::createWindowContainer(win);
   w.setLayout(new QVBoxLayout);
   w.layout()->setMenuBar(menubar);
   w.layout()->setContentsMargins(0,0,0,0);
   w.layout()->addWidget(container);
   w.show();
   return a.exec();
}