added wxWindow::IsFrozen() (only existed in wxMSW and wxDFB before)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41207 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/window.h

@@ -83,6 +83,7 @@ public:
     virtual void Update();
     virtual void Freeze();
     virtual void Thaw();
+    virtual bool IsFrozen() const { return m_frozenness > 0; }
 
     virtual void SetWindowStyleFlag(long style);
     virtual void SetExtraStyle(long exStyle);
@@ -460,9 +461,6 @@ protected:
     virtual void DoCaptureMouse();
     virtual void DoReleaseMouse();
 
-    // has the window been frozen by Freeze()?
-    bool IsFrozen() const { return m_frozenness > 0; }
-
     // this simply moves/resizes the given HWND which is supposed to be our
     // sibling (this is useful for controls which are composite at MSW level
     // and for which DoMoveWindow() is not enough)