Added wxRegion::Offset(x,y)

Go to plan B: wxWindow::Scroll() now moved the
    m_updateRegion for later processing.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13930 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk1/region.h

@@ -66,6 +66,8 @@ public:
     bool operator != ( const wxRegion& region );
 
     void Clear();
+    
+    bool Offset( wxCoord x, wxCoord y );
 
     bool Union( wxCoord x, wxCoord y, wxCoord width, wxCoord height );
     bool Union( const wxRect& rect );