Ref T592, also fire signal after init and doube click of tab bar

src/blackgui/infoarea.h

@@ -189,10 +189,6 @@ namespace BlackGui
         //! Toogle lock tabbar
         void toggleTabBarLocked(bool locked);
 
-    private slots:
-        //! Toggle tab position North - South
-        void toggleTabBarPosition();
-
     private:
         QList<CDockWidgetInfoArea *> m_dockWidgetInfoAreas;
         QList<CInfoArea *> m_childInfoAreas;
@@ -202,6 +198,9 @@ namespace BlackGui
         bool m_showTabBar       = true;   //!< show the tab bar?
         bool m_lockTabBar       = false;  //!< locked: means double clicks ignored
 
+        //! Toggle tab position North - South
+        void toggleTabBarPosition();
+
         //! Tabify the widgets
         void tabifyAllWidgets();