[Windows] QWidget::showMaximized() does not follow SPI_SETWORKAREA correctly when Qt::FramelessWindowHint is set

#include <QtWidgets>
#include <windows.h>

static QLabel *label = nullptr;
static void adjustWorkArea(int height_delta)
{
    RECT rect;
    SystemParametersInfo(SPI_GETWORKAREA, 0, &rect, 0);
    rect.top += height_delta;
    SystemParametersInfo(SPI_SETWORKAREA, 0, &rect, SPIF_UPDATEINIFILE);

    label->setText(
        QStringLiteral(
            "Offset: %1\n\n"
            "Remember to restore the offset to 0!"
        )
        .arg(rect.top)
    );
}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    auto btn_increaseOffset = new QPushButton("Increase work area offset");
    auto btn_decreaseOffset = new QPushButton("Decrease work area offset");
    label = new QLabel;
    auto checkbox_frameless = new QCheckBox("Frameless?");
    auto btn_maximize = new QPushButton("Maximize");
    auto btn_restore = new QPushButton("Restore");

    QWidget win;
    auto layout = new QVBoxLayout(&win);
    layout->addWidget(btn_increaseOffset);
    layout->addWidget(btn_decreaseOffset);
    layout->addWidget(label);
    layout->addWidget(checkbox_frameless);
    layout->addWidget(btn_maximize);
    layout->addWidget(btn_restore);
    win.resize(400, 300);
    win.show();

    adjustWorkArea(0);

    QObject::connect(btn_increaseOffset, &QPushButton::clicked, qApp, [] {
        adjustWorkArea(50);
    });
    QObject::connect(btn_decreaseOffset, &QPushButton::clicked, qApp, [] {
        adjustWorkArea(-50);
    });
    QObject::connect(checkbox_frameless, &QCheckBox::stateChanged, qApp, [&] {
        win.setWindowFlag(Qt::FramelessWindowHint, (checkbox_frameless->checkState() == Qt::Checked));
        win.show();
    });
    QObject::connect(btn_maximize, &QPushButton::clicked, qApp, [&] {
        win.showMaximized();
    });
    QObject::connect(btn_restore, &QPushButton::clicked, qApp, [&] {
        win.showNormal();
    });

    return app.exec();
}