[MERGE][bug 104257] Fix _iter_changes to handle unknowns in a previously empty versioned directory

[Robert Collins]

On Wed, 2007-04-11 at 13:03 -0500, John Arbash Meinel wrote:
> 
> 
> PS> Robert, are you still working on changing the inner loops of
> _iter_changes, so that the implementation can be a bit cleaner? It
> would
> really help if we didn't have so much code duplication here. We need a
> little bit of help to make sure we can skip 'unknown' directories and
> 'tree-reference' trees. 

Yes, its stalled while I rush to get some hpss things for 0.16.

-Rob
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