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Viewing changes to bzrlib/branchbuilder.py

Make merge correctly locate a lca where there is a criss-cross merge
        of a new root.

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bzrlib/branchbuilder.py
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    commit,
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    errors,
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    memorytree,
 
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    revision,
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    )
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        :return: The revision_id of the new commit
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        """
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        if parent_ids is not None:
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            base_id = parent_ids[0]
 
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            if len(parent_ids) == 0:
 
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                base_id = revision.NULL_REVISION
 
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            else:
 
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                base_id = parent_ids[0]
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            if base_id != self._branch.last_revision():
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                self._move_branch_pointer(base_id,
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                    allow_leftmost_as_ghost=allow_leftmost_as_ghost)