wxDC::SetClippingRegion() in wxMSW works like in wxGTK, i.e. combines the given region with the old one (also documented this behaviour as the correct one)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13967 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/dc.h

@@ -235,6 +235,9 @@ protected:
     // common part of DoDrawText() and DoDrawRotatedText()
     void DrawAnyText(const wxString& text, wxCoord x, wxCoord y);
 
+    // common part of DoSetClippingRegion() and DoSetClippingRegionAsRegion()
+    void SetClippingHrgn(WXHRGN hrgn);
+
     // MSW-specific member variables
     int               m_windowExtX;
     int               m_windowExtY;