[pygtk] sorting GenericTreeModels

[Bryan Horvat]

I have a tree model that has been derived from GenericTreeModel, which I
then wrap in a TreeModelSort.  When I'm running my program with gtk version
2.6, everything displays correctly.  However, when using version 2.10 or
higher, only the top-level rows get displayed.  None of the child rows in my
model get displayed at all.  I assume that this is due to my TreeModelSort
object incorrectly sorting the items in my GenericTreeModel object, and
creating "sorted paths" which don't exist, and which, thus, can't be
displayed by the TreeView.  Or, at least, that's my only guess.  Has
anything significant in TreeModelSort or TreeSortable changed between
versions 2.6 and 2.10 that might be causing this?

Thanks,
Bryan
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