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Add a Branch.set_last_revision smart method, and make RemoteBranch.set_revision_history use it.  Also some test tweaks.

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bzrlib/remote.py
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        return result
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    def set_revision_history(self, rev_history):
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        self._ensure_real()
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        return self._real_branch.set_revision_history(rev_history)
 
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        # Send just the tip revision of the history; the server will generate
 
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        # the full history from that.  If the revision doesn't exist in this
 
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        # branch, NoSuchRevision will be raised.
 
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        path = self.bzrdir._path_for_remote_call(self._client)
 
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        if rev_history == []:
 
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            rev_id = ''
 
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        else:
 
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            rev_id = rev_history[-1]
 
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        response = self._client.call('Branch.set_last_revision', path, rev_id)
 
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        if response[0] == 'NoSuchRevision':
 
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            raise NoSuchRevision(self, rev_id)
 
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        else:
 
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            assert response == ('ok',), (
 
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                'unexpected response code %r' % (response,))
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    def get_parent(self):
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        self._ensure_real()