IsExposed() needs to reverse the direction in RTL.

I actually wonder if not the calling code is wrong,
    but this fixes wxListCtrl and wxTreeCtrl for the
    time being.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41836 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/window.cpp

@@ -3822,11 +3822,9 @@ bool wxWindowGTK::DoIsExposed( int x, int y ) const
 
 bool wxWindowGTK::DoIsExposed( int x, int y, int w, int h ) const
 {
-#if 0
     if (GetLayoutDirection() == wxLayout_RightToLeft)
         return m_updateRegion.Contains(x-w, y, w, h) != wxOutRegion;
     else
-#endif
         return m_updateRegion.Contains(x, y, w, h) != wxOutRegion;
 }