Re: rethinking GtkTreeModelSort


Other points:

 - You only have to implement sorting for custom models, so that's the
   only place TreeModelSort helps; but frequently the purpose of a
   custom model is to get more speed or less memory usage. So
   TreeModelSort is useful exactly in the cases where its overhead
   isn't really acceptable.

 - We can always add TreeModelSort and the ITER_PERSISTS flag 
   in a future version


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