QMetaMethod::invoke: Support passing arguments constructed via QMetaType::create()

#include <QCoreApplication>
#include <QDebug>
#include <QMetaMethod>
#include <QMetaType>
#include <QObject>
#include <cassert>

class MyGadget {
    Q_GADGET
public:
    void gogo()
    {
        qInfo() << Q_FUNC_INFO;
    }
};

class MyObject : public QObject {
    Q_OBJECT

public:
    Q_INVOKABLE void gogoGadget(MyGadget gadget)
    {
        qInfo() << Q_FUNC_INFO;
        gadget.gogo();
    }
};

int main(int argc, char** argv)
{
    QCoreApplication app(argc, argv);
    qRegisterMetaType<MyGadget>();

    const QMetaType gadgetType = QMetaType::fromName("MyGadget");
    void* gadgetInstance = gadgetType.create();

    MyObject obj;
    const int gogoMethodIndex = obj.metaObject()->indexOfMethod("gogoGadget(MyGadget)");
    const QMetaMethod gogoMethod = obj.metaObject()->method(gogoMethodIndex);
    gogoMethod.invoke(&obj, QGenericReturnArgument(), QGenericArgument("MyGadget", gadgetInstance));

    gadgetType.destroy(gadgetInstance);

    return 0;
}

#include "moc_metamethodinvoke.cpp"