OS/2 scrolling support

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13988 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/window.h

@@ -845,6 +845,7 @@ protected:
     bool                 m_themeEnabled;
 
 protected:
+
     // common part of all ctors: it is not virtual because it is called from
     // ctor
     void InitBase();
@@ -935,7 +936,13 @@ protected:
     // a toolbar that it manages itself).
     virtual void AdjustForParentClientOrigin(int& x, int& y, int sizeFlags);
 
+#ifdef __WXPM__
+    // extra OS/2 layout processing
+    virtual void OS2Layout(int width, int height) { };
+#endif
+
 private:
+
     // contains the last id generated by NewControlId
     static int ms_lastControlId;