QML: Re-add QMetaType::convert() attempt for argument conversion

There are people who depend on QMetaType to convert their types. This is
not nice, but removing it breaks compatibility.

Fixes: QTBUG-114340
Change-Id: I0a7f54b8fd0f77b71e7e56f65ef7d6f91c876237
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
(cherry picked from commit 761b455d4741bdbef47845623d6f44bdc8a464b5)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllanguage/testtypes.h b/tests/auto/qml/qqmllanguage/testtypes.h
index 3b4f612127..1220f70b3f 100644
--- a/tests/auto/qml/qqmllanguage/testtypes.h
+++ b/tests/auto/qml/qqmllanguage/testtypes.h
@@ -2426,6 +2426,11 @@ struct UnregisteredValueBaseType
     int foo = 12;
 };
 
+struct UnregisteredValueDerivedType: public UnregisteredValueBaseType
+{
+    int bar = 13;
+};
+
 class UnregisteredValueTypeHandler: public QObject
 {
     Q_OBJECT
@@ -2435,6 +2440,7 @@ public:
 
 public slots:
     UnregisteredValueBaseType produce() { return UnregisteredValueBaseType(); }
+    UnregisteredValueDerivedType produceDerived() { return UnregisteredValueDerivedType(); }
     void consume(UnregisteredValueBaseType) { ++consumed; }
 };