On qt version change updat qmakestep config widget

That is the effective qmake command and summary label.

src/plugins/qt4projectmanager/qmakestep.cpp

@@ -209,6 +209,8 @@ QMakeStepConfigWidget::QMakeStepConfigWidget(QMakeStep *step)
     connect(m_ui.buildConfigurationComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(buildConfigurationChanged()));
     connect(step, SIGNAL(changed()),
             this, SLOT(update()));
+    connect(step->project(), SIGNAL(qtVersionChanged(ProjectExplorer::BuildConfiguration *)),
+            this, SLOT(qtVersionChanged(ProjectExplorer::BuildConfiguration *)));
 }
 
 QString QMakeStepConfigWidget::summaryText() const
@@ -216,6 +218,14 @@ QString QMakeStepConfigWidget::summaryText() const
     return m_summaryText;
 }
 
+void QMakeStepConfigWidget::qtVersionChanged(ProjectExplorer::BuildConfiguration *bc)
+{
+    if (bc && bc->name() == m_buildConfiguration) {
+        updateTitleLabel();
+        updateEffectiveQMakeCall();
+    }
+}
+
 void QMakeStepConfigWidget::updateTitleLabel()
 {
     Qt4Project *qt4project = qobject_cast<Qt4Project *>(m_step->project());

src/plugins/qt4projectmanager/qmakestep.h

@@ -107,6 +107,7 @@ private slots:
     void qmakeArgumentsLineEditTextEdited();
     void buildConfigurationChanged();
     void update();
+    void qtVersionChanged(ProjectExplorer::BuildConfiguration *bc);
 private:
     void updateTitleLabel();
     void updateEffectiveQMakeCall();

src/plugins/qt4projectmanager/qt4project.cpp

@@ -984,6 +984,7 @@ int Qt4Project::qtVersionId(BuildConfiguration *configuration) const
 void Qt4Project::setQtVersion(BuildConfiguration *configuration, int id)
 {
     configuration->setValue(KEY_QT_VERSION_ID, id);
+    emit qtVersionChanged(configuration);
     updateActiveRunConfiguration();
 }
 

src/plugins/qt4projectmanager/qt4project.h

@@ -238,6 +238,7 @@ public:
     static QString extractSpecFromArgumentList(const QStringList &list);
 signals:
     void targetInformationChanged();
+    void qtVersionChanged(ProjectExplorer::BuildConfiguration *);
 
 public slots:
     void update();