QWidget in WindowContainer focus problem

#include "containerwidget.h"#include <QApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include <QQuickWindow>
constexpr QMargins contentsMargins = {20, 20, 20, 20};
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    ContainerWidget *container = new ContainerWidget;
    container->setMinimumSize(QSize(800,480));
    container->setAttribute(Qt::WA_NativeWindow); // !!
    QWindow *wdgWin = container->windowHandle();
    container->setVisible(true);    QQmlApplicationEngine engine;
    engine.setInitialProperties({{ "widgetWindow", QVariant::fromValue(wdgWin) }});    engine.load(QUrl(QLatin1String("qrc:/Main.qml")));     auto &quickWindow = *qobject_cast<QQuickWindow *>(engine.rootObjects().first());    quickWindow.showNormal();    return app.exec();
}
 

import QtQuickWindow {
    title: "Qt Quick"
    color: "#2CDE85"
    required property QtObject widgetWindow;    property int contentsMargins: 20    width: widgetWindow.minimumWidth + contentsMargins * 2
    height: widgetWindow.minimumHeight + contentsMargins * 2    WindowContainer {
        id: calendar
        window: widgetWindow
        width: window.minimumWidth
        height: window.minimumHeight
        anchors.centerIn: parent
    }
} 

#include "containerwidget.h"ContainerWidget::ContainerWidget(QWidget *parent)
    : QWidget(parent)
{    auto *layout = new QVBoxLayout(this);    QLineEdit * line1 = new QLineEdit(this);
    line1->setFocusPolicy(Qt::WheelFocus);    QLineEdit * line2 = new QLineEdit(this);
    line2->setFocusPolicy(Qt::StrongFocus);    QLineEdit * line3 = new QLineEdit(this);
    line3->setFocusPolicy(Qt::ClickFocus);    QLineEdit * line4 = new QLineEdit(this);
    line4->setFocusPolicy(Qt::TabFocus);    layout->addWidget(line1);
    layout->addWidget(line2);
    layout->addWidget(line3);
    layout->addWidget(line4);
    layout->addWidget(new QPushButton(this));
}ContainerWidget::~ContainerWidget() {}