#include <QGraphicsView>
#include <QGraphicsScene>
#include <QGraphicsRectItem>
#include <QApplication>
#include <QDebug>

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

    for (int i = 0; i< 25; i++)
    {
        QPointF pos(75000 + qrand()%1000, 125000 + qrand()%750);
        QGraphicsRectItem* rect = scene.addRect(QRect(-5, -5, 10, 10), QPen(Qt::blue), Qt::white);
        rect->setPos(pos);
        rect->setFlag(QGraphicsRectItem::ItemIgnoresTransformations);
        rect->setFlag(QGraphicsRectItem::ItemIsSelectable);

        // The following line is a workaround for the problem
        //rect->mapToScene(QPointF(0, 0));
    }

    // The following line is a workaround for the problem
    //scene.setSceneRect(scene.sceneRect());

    QGraphicsView view(&scene);
    view.setDragMode(QGraphicsView::RubberBandDrag);
    view.show();

    QObject::connect(&scene, &QGraphicsScene::sceneRectChanged, [=](const QRectF& newRect) {qDebug() << newRect; });

    return app.exec();
}