Got a new idea to do cursors, including global

ones and busy etc.
  Fixed an assert in UserScaler from PS code.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2577 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dcclient.h

@@ -118,6 +118,8 @@ public:
 
     void SetUpDC();
     void Destroy();
+    void ComputeScaleAndOrigin();
+
     GdkWindow *GetWindow() { return m_window; }
 };