Make it possible to Show/Hide the sidebar in help mode.

Task-number: QTCREATORBUG-1533

Change-Id: I0ac767db5bcbda12a9d8ba1572ee75881308d0d0
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/plugins/coreplugin/sidebar.cpp

@@ -244,8 +244,10 @@ void SideBar::closeSubWidget()
         removeSideBarWidget(widget);
         updateWidgets();
     } else {
-        if (d->m_closeWhenEmpty)
+        if (d->m_closeWhenEmpty) {
             setVisible(false);
+            emit sideBarClosed();
+        }
     }
 }
 

src/plugins/coreplugin/sidebar.h

@@ -119,6 +119,7 @@ public:
     QMap<QString, Core::Command *> shortcutMap() const;
 
 signals:
+    void sideBarClosed();
     void availableItemsChanged();
 
 private slots: