[MERGE] Nested trees: misc

[Robert Collins]

On Tue, 2009-04-07 at 14:21 -0400, Aaron Bentley wrote:
> 
> +        subtree = tree.extract('subtree-id')
> +        tree._write_inventory(tree.inventory)
> +        tree.add_reference(subtree)

This is problematic - if you have to call _write_inventory externally to
use tree.extract() correctly, then we're making _write_inventory
de-facto public.

Is the _write_inventory call needed?

bb:comment
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