[Mono-winforms-list] datagrid layout patch

[Chris Toshok]

The initial layout of the datagrid (CalcGridAreas in particular) ends up
recursively calling itself (on one test it was being invoked 5 or 6
times.)  You can see this happening with a large datagrid by watching
the vertical scrollbar's slider change size as it lays out.
        
This patch calculates the layout/positioning of everything in a single
pass, which speeds things up quite a bit.
        
Chris
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