[MERGE] commit returns revision id

[Aaron Bentley]

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Robert Collins wrote:
> Its easier to write tests that dont care about a revision id, if the
> commit() call returns one...

+1

> +        committed_id = Commit().commit(
> +            working_tree=self, revprops=revprops, *args, **kwargs)

This indenting looks a little odd.  It looks like working_tree and
revpropos would probably fit on the top line.

Aaron
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