QGraphicsView constructor overriding InputMethod enabling.

I am using Qt 4.6.1 version, and found a bug in the constructor of QGraphicsView.

 QGraphicsView::QGraphicsView(QGraphicsScene *scene, QWidget *parent)
    : QAbstractScrollArea(*new QGraphicsViewPrivate, parent)
{
    setScene(scene);
    setViewport(0);
    setAcceptDrops(true);
    setBackgroundRole(QPalette::Base);
    // Investigate leaving these disabled by default.
    setAttribute(Qt::WA_InputMethodEnabled);
    viewport()->setAttribute(Qt::WA_InputMethodEnabled);
}

As SetScene updates the Qt::WA_InputMethodEnabled flag internally and it is overridden by the next lines to true.

And when control reaches to the QApplication (when the first time QGraphicsView launched), QApplication calls QInputContext::setFocusWidget(view_pointer) even if there is no focused item inside the QGraphicsScene, which I feel is not correct. And this is done before sending the focusinevent to the QGraphicsView, so view didn't get a change to update inputmethod sensitivity.

A fix could be.

QGraphicsView::QGraphicsView(QGraphicsScene *scene, QWidget *parent)
    : QAbstractScrollArea(*new QGraphicsViewPrivate, parent)
{
    setScene(scene);
    setViewport(0);
    setAcceptDrops(true);
    setBackgroundRole(QPalette::Base);
}

Easy to reproduce. Just write below code.

QGraphicsScene scene;
QGraphicsView view(&scene);
view.show();

And put a break point in the QWinInputContext::setFocusWidget(QWidget *w) if you are on windows system.