External WM_DESTROY received for QWidgetWindow in embedded QWindow - qt

Question

I am trying to add a QWidget to a QQuick 2 application.
The approach is the following:
Create a QQuickItem derived object, which creates the QWidget in an initialize function. The QWindow is obtained from the QWidget and reparented to the "main" QQuickWindow.
During runtime the result is very good (it looks like a normal view, not an external window).
However when I close the main window I receive:
External WM_DESTROY received for QWidgetWindow(0x202b3a4ffe0, name="QWidgetClassWindow") , parent: QWindow(0x0) , transient parent: QWindow(0x0)
Any idea how to avoid this warning?
QML:
import QtQuick 2.12
import QtQuick.Controls 2.5
import QtQuick.Window 2.2
import QWidgetWrapper 1.0
import QtQml 2.12
Item {
id: root
QWidgetWrapper {
id: ewas
anchors.fill: parent
Component.onCompleted: {
initialize(Window.window)
}
}
}
Cpp:
#pragma once
#include <QQuickItem>
#include <QWindow>
class QWidgetWrapper : public QQuickItem
{
Q_OBJECT
public:
QWidgetWrapper(QQuickItem *parent = nullptr) : QQuickItem(parent) {}
~QWidgetWrapper() {
}
Q_INVOKABLE void initialize(QWindow *window) {
m_widget = new QWidget();
m_widget->setWindowFlags(Qt::FramelessWindowHint);
m_widgetWindow = QWindow::fromWinId(m_widget->winId());
m_widgetWindow->setParent(window);
m_widget->show();
}
private:
QWidget *m_widget = nullptr;
QWindow *m_widgetWindow = nullptr;
};