In the FancyActionBar, trigger a button's default action

also when a context menu action is selected.

This allows the user e.g. to select and run a specific run
configuration with one click.

src/plugins/coreplugin/fancyactionbar.h

@@ -64,6 +64,8 @@ public:
     void paintEvent(QPaintEvent *event);
     void insertAction(int index, QAction *action, QMenu *menu = 0);
 
+private slots:
+    void toolButtonContextMenuActionTriggered(QAction*);
 private:
     QVBoxLayout *m_actionsLayout;
 };