Added test case and setting Test configuration

qt6-after/qt6-migrated-legatus/Lts/DDS/FTC/generic_ftc_impl.h

@@ -377,8 +377,13 @@ class GenericFtcImpl final : public GenericFtc<TOPICTYPE_REQUEST, TOPICTYPE_REPL
                 {
                     INFO_LOG(m_logger) << "#receiveReply for " << TopicNameHelper::replyTopicTypeName();
 
+                    // Qt 6's Q_ARG yields QMetaMethodArgument, which cannot be mixed with
+                    // the Qt 5 QArgument<T> used here. The topic type is registered under a
+                    // runtime name (see qRegisterMetaType above), so Q_ARG's stringified
+                    // type name is not usable; build the argument the way Q_ARG does.
                     request.replySlot.invoke(m_objToInform, Qt::QueuedConnection,
-                                             QArgument<ReplyTopic>(TopicNameHelper::replyTopicTypeName(), reply.data()),
+                                             QtPrivate::Invoke::argument<ReplyTopic>(
+                                                 TopicNameHelper::replyTopicTypeName(), reply.data()),
                                              Q_ARG(int, request.uniqueId), Q_ARG(bool, !inProgress));
                 }
                 else
@@ -503,6 +508,8 @@ class GenericFtcImpl final : public GenericFtc<TOPICTYPE_REQUEST, TOPICTYPE_REPL
     bool m_dying{false};
     std::string m_partitionType;
     int m_partitionId;
+    // Declared after m_partitionId to match the constructor initialiser order.
+    DDS::LOGGER_T m_logger;
     std::mutex m_requestMutex;
 };