Fix changing wxWindow ID in wxMSW.

This must be done both at wxWidgets and MSW level, otherwise changing the ID
results in window not recognizing itself as the recipient of the messages sent
to it by Windows.

Closes #3697.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76672 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/window.h

@@ -115,6 +115,8 @@ public:
                                              wxCoord width,
                                              wxCoord widthTotal) const;
 
+    virtual void SetId(wxWindowID winid);
+
 #if wxUSE_DRAG_AND_DROP
     virtual void SetDropTarget( wxDropTarget *dropTarget );
 #endif // wxUSE_DRAG_AND_DROP