Make floating gdb views possible. Hiding when mode is switched.

src/plugins/debugger/debuggermanager.h

@@ -217,7 +217,9 @@ public slots:
 
     void setSimpleDockWidgetArrangement();
     void setLocked(bool locked);
-    void dockToggled(bool on);
+    void setFloatingDockWidgetsVisible(bool visible);
+    void updateDockWidgetActiveStates();
+    void dockActionTriggered();
 
     void setBusyCursor(bool on);
     void queryCurrentTextEditor(QString *fileName, int *lineNumber, QObject **ed);
@@ -399,6 +401,7 @@ private:
     QDockWidget *m_threadsDock;
     QDockWidget *m_watchDock;
     QList<QDockWidget*> m_dockWidgets;
+    QList<bool> m_dockWidgetActiveState;
 
     BreakHandler *m_breakHandler;
     DisassemblerHandler *m_disassemblerHandler;