~bzr-pqm/bzr/bzr.dev

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Merge bzr.dev

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            revision_tree = revision_source.revision_tree(rev_id)
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            last_rev_id = rev_id
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            last_tree = revision_tree
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            delta = parent_tree.changes_from(revision_tree)
 
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            delta = revision_tree.changes_from(parent_tree)
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        else:
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            delta = None
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        yield revno, rev, delta