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old_tree = repository.revision_tree(old_revision)
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old_tree = apply_merges(old_tree, branch, merges)
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new_tree = repository.revision_tree(new_revision)
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diff.show_diff_trees(old_tree, new_tree, to_file, old_label='',
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def ignore_heads(repository, ignore_branches, old_revision, new_revision):