QGraphicsProxyWidget has clipped context menu in QGraphicsScene - qt

Question

The following code is based on the documentation of Graphics View Framework. I embed a QLineEdit in a QGraphicsScene and run the program. When I right click the line edit in the scene I get a clipped context menu. The context menu of a QGraphicsProxyWidget is drawn by the scene as a child QGraphicsProxyWidget so it get's clipped if the window is too small. I want all embedded widgets to show their context menus as top-level windows like they do when not being embedded in a QGraphicsScene. I have tried the BypassGraphicsProxyWidget flag in two ways but it doesn't work as I want. Tested on Qt 4.8 / 5.0 on Linux and Windows. Same issue on all platforms.
How can I make the embedded widgets display normal, top-level context menus with native look? Overloading QGraphicsView's contextMenuEvent gives a native top-level context menu - could I do some sort of delegation and make QGraphicsView display the context menu of embedded widgets in the scene?
#include <QApplication>
#include <QLineEdit>
#include <QGraphicsScene>
#include <QGraphicsProxyWidget>
#include <QGraphicsView>
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QGraphicsScene scene;
QGraphicsProxyWidget *proxy = scene.addWidget(new QLineEdit(), Qt::BypassGraphicsProxyWidget);
QGraphicsView view(&scene);
view.setWindowFlags(Qt::BypassGraphicsProxyWidget);
view.show();
return app.exec();
}

Answer 1

Unfortunately, this is a known bug QTBUG-10683. A workaround is suggested in the last comment to the bug report.

Answer 2

You get native context menus by adding a QWidget that has the Qt::BypassGraphicsProxyWidget set. Children will render it's context menus as pop-ups native style.
#ifndef QGLPARENT_H
#define QGLPARENT_H
#include <QGLWidget>
#include <QGraphicsScene>
#include <QGraphicsProxyWidget>
#include <QGraphicsView>
class QGLParent : public QGraphicsView
{
private:
QGraphicsProxyWidget *child;
public:
QGLParent(QWidget *parent, QWidget *child) : QGraphicsView(parent)
{
setFrameShape(QFrame::NoFrame);
QGLFormat format(QGL::SampleBuffers);
format.setSwapInterval(1);
setScene(new QGraphicsScene());
setViewport(new QGLWidget(format));
//setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
child->setWindowFlags(Qt::BypassGraphicsProxyWidget);
this->child = scene()->addWidget(child);
}
protected:
void resizeEvent(QResizeEvent *event)
{
scene()->setSceneRect(QRect(QPoint(0, 0), event->size()));
child->resize(event->size().width(), event->size().height());
QGraphicsView::resizeEvent(event);
}
};
#endif