QT Quick, content drawn below caption/title bar on windows?

    import QtQuick.Controls 2.1
    import QtQuick.Window 2.2
    import QtQuick.Layouts 1.3
    
    ApplicationWindow {
        visible: true
        width: 640
        height: 480
    
        Rectangle{
            width: 100
            x: 0
            y: 0
            height: 35
            color: "#888888"
        }
    }

    #include <QGuiApplication>
    #include <QQmlApplicationEngine>
    
    int main(int argc, char *argv[])
    {
        QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
        QGuiApplication app(argc, argv);
    
        QQmlApplicationEngine engine;
        engine.load(QUrl(QLatin1String("qrc:/main.qml")));
        if (engine.rootObjects().isEmpty())
            return -1;
    
        return app.exec();
    }