moc: Do not fail to compile meta-methods containing non-const ref types

Amends 2d0c31e7d92a3e9df4ce2b9c1d41b94fb12735fc. We were using
MetaTypeDecay in qTryMetaTypeInterfaceForType; but that is not used by
moc when complete types are enforced. Change qt_metaTypeArray to also
use qTryMetaTypeInterfaceForType, so that the code path for "force
complete types"[0] and the normal one do not diverge.

[0] Most easily enabled by using one of the QML type registration
macros.

Fixes: QTBUG-106672
Change-Id: I9bf14873d1d0c4127a676643f7e8eb77f6e42dc8
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit a8ccd9cd848be9aafd2d07d83a8897dc8b2a0cb3)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/corelib/kernel/qmetatype.h

@@ -2512,7 +2512,14 @@ constexpr const QMetaObject *QMetaType::metaObject() const
 
 template<typename... T>
 constexpr const QtPrivate::QMetaTypeInterface *const qt_metaTypeArray[] = {
-    QtPrivate::qMetaTypeInterfaceForType<T>()...
+    /*
+       Unique in qTryMetaTypeInterfaceForType does not have to be unique here
+       as we require _all_ types here to be actually complete.
+       We just want to have the additional type processing that exist in
+       QtPrivate::qTryMetaTypeInterfaceForType as opposed to the normal
+       QtPrivate::qMetaTypeInterfaceForType used in QMetaType::fromType
+    */
+    QtPrivate::qTryMetaTypeInterfaceForType<void, QtPrivate::TypeAndForceComplete<T, std::true_type>>()...
 };
 
 constexpr const char *QMetaType::name() const

tests/auto/tools/moc/qmlmacro.h

@@ -0,0 +1,19 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+
+#ifndef QMlMACRO_H
+#define QMlMACRO_H
+
+#include <QObject>
+#include <QByteArray>
+
+struct QmlMacro : QObject
+{
+    Q_OBJECT
+    Q_CLASSINFO("QML.Element", "auto")
+
+    signals:
+    void f(QByteArray &b);
+};
+#endif

tests/auto/tools/moc/tst_moc.cpp

@@ -56,6 +56,8 @@
 #include "fwdclass2.h"
 #include "fwdclass3.h"
 
+#include "qmlmacro.h"
+
 #ifdef Q_MOC_RUN
 // check that moc can parse these constructs, they are being used in Windows winsock2.h header
 #define STRING_HASH_HASH(x) ("foo" ## x ## "bar")