Tree._iter_changes(specific_files=[]) behaviour.

[Aaron Bentley]

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Wouter van Heyst wrote:
> set of interesting_ids, but now it is left to tree._iter_changes. When
> you pass specific_files=[] to tree._iterchanges it iterates over all the
> changes between the two trees.
> 
> I think my question is, what do we want _iter_changes(specific_files=[])
> to do? Klaus ran into similar questions for tree.{revert,add,commit},
> they're not consistent in handling files=[].

I think the empty list should cause no files to be selected, and None
should cause all files to be selected.

Aaron
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