QmlDebugger: reseting internal state on engine setup

reviewed-by: Friedemann Kleint

src/plugins/debugger/qml/qmlcppengine.cpp

@@ -375,6 +375,8 @@ void QmlCppEngine::executeDebuggerCommand(const QString &command)
 void QmlCppEngine::setupEngine()
 {
     EDEBUG("\nMASTER SETUP ENGINE");
+    d->m_activeEngine = d->m_cppEngine;
+    d->m_stackBoundary = 0;
     d->m_qmlEngine->setupSlaveEngine();
     d->m_cppEngine->setupSlaveEngine();
 }

src/plugins/debugger/qml/qmlengine.cpp

@@ -346,6 +346,7 @@ void QmlEngine::shutdownEngine()
 
 void QmlEngine::setupEngine()
 {
+    d->m_ping = 0;
     d->m_adapter.setMaxConnectionAttempts(MaxConnectionAttempts);
     d->m_adapter.setConnectionAttemptInterval(ConnectionAttemptDefaultInterval);
     connect(&d->m_adapter, SIGNAL(connectionError(QAbstractSocket::SocketError)),