[attn aaron] differences between RevisionTree and WorkingTree

[Aaron Bentley]

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Robert Collins wrote:
> Looks to me like the cleanest way to fix this is for
> inventory.iter_entries() to yield self.root as well as the other
> elements.
> 
> That sound ok to everyone ?

I think you'll wind up duplicating a lot of the effort in nested-trees.

Aaron
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