Same bug with 13.10, fresh install.

#include <QApplication>
#include <QPushButton>
#include <QGraphicsScene>
#include <QGraphicsProxyWidget>
#include <QGraphicsView>

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

    //app.setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);

    QPushButton *pushButton = new QPushButton("Quit App.");
    QGraphicsScene scene;
    QGraphicsProxyWidget *proxy = scene.addWidget(pushButton);
    QGraphicsView view(&scene);

    // if the view is not defined as the parent it opens in another windows
    // this is qt5 behaviour only
    pushButton->setParent(&view);

    QObject::connect(pushButton, SIGNAL(clicked()),
                     &app, SLOT(quit()));

    view.show();

    return app.exec();
}


** Attachment added: "Qt5.0.2_garbage_windows_example.ogv"
   
https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1243239/+attachment/3903563/+files/Qt5.0.2_garbage_windows_example.ogv

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https://bugs.launchpad.net/bugs/1243239

Title:
  Hidden windows of Qt 5 applications are visible

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