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# in one go, and the user probably will have seen a warning about
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1234
# the server being old anyhow.
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rg = self._get_revision_graph(None)
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# get_revision_graph. Specifically, a "key:()" pair in
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1238
# get_revision_graph just means a node has no parents. For
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1239
# "get_parent_map" it means the node is a ghost. So fix up the