[attn aaron] differences between RevisionTree and WorkingTree

[Aaron Bentley]

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Robert Collins wrote:
> Heres an interesting little quirk - 

> I'd like to make this consistent in some manner - Aaron, what would work
> best with your tree root work ?

The RevisionTree behaviour would be best.  One of the pushes of the
nested-trees work is to make the root entry as similar to the other
entries as possible.

Aaron
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