Input method hints are not correct if using proxy widget

#include <QtGui/QApplication>
#include <QLineEdit>
#include <QGraphicsView>
#include <QGraphicsProxyWidget>
#include <QGraphicsWidget>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QGraphicsView graphicsView;
    QGraphicsScene scene;
    graphicsView.setScene(&scene);

    QGraphicsWidget gw;

    QWidget w;
    QLineEdit* lineEdit = new QLineEdit(/* &w */); // Change this. Parent will break vkb password
    lineEdit->setEchoMode(QLineEdit::Password);
    lineEdit->setInputMethodHints(Qt::ImhHiddenText| Qt::ImhNoPredictiveText | Qt::ImhNoAutoUppercase);

    QGraphicsProxyWidget* pw = new QGraphicsProxyWidget();
    pw->setWidget(lineEdit /* &w */);   // Change this.
    pw->setFlag(QGraphicsItem::ItemAcceptsInputMethod);
    pw->setParentItem(&gw);
    scene.addItem(pw);

    graphicsView.showMaximized();

    return app.exec();
}