QmlDebugger: Hit breakpoints for simple bindings also for .qmlproject

Make sure QML_DISABLE_OPTIMIZER is set also when debugging with
qmlobserver

Change-Id: I33aa4cd50ae184e339e3783488ba236eecdf7b33
Reviewed-on: http://codereview.qt.nokia.com/2753Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Christiaan Janssen <christiaan.janssen@nokia.com>

src/plugins/qmlprojectmanager/qmlprojectruncontrol.cpp

@@ -207,6 +207,13 @@ RunControl *QmlProjectRunControlFactory::createDebugRunControl(QmlProjectRunConf
     params.projectSourceDirectory = runConfig->target()->project()->projectDirectory();
     params.projectSourceFiles = runConfig->target()->project()->files(Project::ExcludeGeneratedFiles);
 
+    // Makes sure that all bindings go through the JavaScript engine, so that
+    // breakpoints are actually hit!
+    const QString optimizerKey = QLatin1String("QML_DISABLE_OPTIMIZER");
+    if (!params.environment.hasKey(optimizerKey)) {
+        params.environment.set(optimizerKey, QLatin1String("1"));
+    }
+
     if (params.executable.isEmpty()) {
         QmlProjectPlugin::showQmlObserverToolWarning();
         return 0;