allow qml demo choose special effect

Yuhang Zhao

2023-12-28 68c8cc026233e9694579ce38b8daa25008477d18

 src/core/contexts/win32windowcontext.cpp

@@ -680,7 +680,7 @@
    }

    QVariant Win32WindowContext::windowAttribute(const QString &key) const {
        if (key == QStringLiteral("title-bar-rect")) {
        if (key == QStringLiteral("window-rect")) {
            if (!m_windowHandle)
                return {};