QML Observer: Complain about not having it if debugging .qmlprojects

Reviewed-by: hjk

src/plugins/debugger/qml/qmlengine.cpp

@@ -30,6 +30,7 @@
 #include "qmlengine.h"
 #include "qmladapter.h"
 
+#include "debuggeractions.h"
 #include "debuggertooltip.h"
 #include "debuggerconstants.h"
 #include "debuggerplugin.h"
@@ -315,6 +316,13 @@ void QmlEngine::shutdownEngine()
 
 void QmlEngine::setupEngine()
 {
+    if (!d->m_attachToRunningExternalApp
+     && !startParameters().qmlObserverAvailable
+     && Internal::theDebuggerBoolSetting(Internal::UseQmlObserver))
+    {
+        showQmlObserverToolWarning();
+    }
+
     d->m_adapter->setMaxConnectionAttempts(MaxConnectionAttempts);
     d->m_adapter->setConnectionAttemptInterval(ConnectionAttemptDefaultInterval);
     connect(d->m_adapter, SIGNAL(connectionError(QAbstractSocket::SocketError)),