Blink timer for QLineEdit not killed after QMenu spawn

#include <QApplication>
#include "widget.h"

int main(int argc, char * argv[])
{
    QApplication app{argc, argv};
    Widget w;
    w.show();

    return app.exec();
}

#if !defined(WIDGET_H)
#define WIDGET_H

#include <QFrame>

class QProxyStyle;

class Widget : public QFrame
{   
    Q_OBJECT
public:
    Widget(QFrame * parent = 0, Qt::WindowFlags f = 0);
    ~Widget();

private:
    QScopedPointer<QProxyStyle> mStyle;
};

#endif //WIDGET_H

#include "widget.h"
#include <QDebug>
#include <QGridLayout>
#include <QLineEdit>
#include <QPushButton>
#include <QProxyStyle>
#include <QWidgetAction>
#include <QMenu>
#include <QDateTime>
    
namespace
{   
    class StyleHelper : public QProxyStyle
    {
    public:
        using QProxyStyle::QProxyStyle;
        virtual int pixelMetric(PixelMetric metric, const QStyleOption * option = 0, const QWidget * widget = 0 ) const override
        {
            qDebug().noquote() << QDateTime::currentDateTime().toString(Qt::SystemLocaleLongDate) << metric;
            return QProxyStyle::pixelMetric(metric, option, widget);
        }
    };

}

Widget::Widget(QFrame * parent, Qt::WindowFlags f)
    : QFrame{parent, f | Qt::WindowDoesNotAcceptFocus}
    , mStyle{new StyleHelper}
{
    setFixedSize({200, 200});
    QLineEdit * edit = new QLineEdit;
    edit->setStyle(mStyle.data());

    QWidgetAction * action = new QWidgetAction{this};
    action->setDefaultWidget(edit);

    QMenu * menu = new QMenu{this};
    menu->addAction(action);

    QPushButton * button = new QPushButton{QStringLiteral("show/hide")};
    connect(button, &QAbstractButton::clicked, [edit, menu]
        {
            if (menu->isVisible())
                menu->hide();
            else
            {
                menu->popup(QCursor::pos());
            }
        });
    
    QGridLayout * l = new QGridLayout;
    setLayout(l);
    l->addWidget(button, 0, 0);
}
            
Widget::~Widget()
{       
}