Fix refreshs for wxGTK.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5926 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/grid.cpp

@@ -1461,6 +1461,7 @@ void wxGrid::CalcCellsExposed( wxRegion& reg )
         CalcUnscrolledPosition( r.GetLeft(), r.GetTop(), &left, &top );
         CalcUnscrolledPosition( r.GetRight(), r.GetBottom(), &right, &bottom );
 
+	left++; top++; 
         // find the cells within these bounds
         //
         int row, col;