QmlCpp debugger: Fix clicking on QML stack traces

Change-Id: I1e83dfc490bc871d106fb44357759829b3a1a6c4
Reviewed-on: http://codereview.qt.nokia.com/3593
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/qml/qmlcppengine.cpp

@@ -129,7 +129,7 @@ void QmlCppEnginePrivate::qmlStackChanged()
 {
     StackFrames frames = m_qmlEngine->stackHandler()->frames();
     q->stackHandler()->setFrames(frames);
-    m_stackBoundary = frames.size();
+    m_stackBoundary = 0;
 }