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pb = ui.ui_factory.nested_progress_bar()
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this_repo = self.this_branch.repository
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revisions = [ensure_null(self.this_basis),
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ensure_null(self.other_basis)]
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if NULL_REVISION in revisions:
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self.base_rev_id = NULL_REVISION
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if self.base_rev_id == NULL_REVISION:
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raise UnrelatedBranches()