More RTL work. Now transform m_updateRegion and

do nothing special in IsExposed() since some
   code may use m_updateRegion directly. Keep
   untransformed version around for use with
   GTK clipping in the DC.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41277 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/window.h

@@ -307,6 +307,7 @@ public:
     bool                 m_hasFocus:1;          // true if == FindFocus()
     bool                 m_isScrolling:1;       // dragging scrollbar thumb?
     bool                 m_clipPaintRegion:1;   // true after ScrollWindow()
+    wxRegion             m_nativeUpdateRegion;  // not transformed for RTL
     bool                 m_dirtyTabOrder:1;     // tab order changed, GTK focus
                                                 // chain needs update
     bool                 m_needsStyleChange:1;  // May not be able to change