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bzrlib/annotate.py
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    :param heads_provider: When parents disagree on the lineage of a line, we
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        need to check if one side supersedes the other.
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    """
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    assert len(new_lines) == len(annotated_lines)
 
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    if len(new_lines) != len(annotated_lines):
 
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        raise AssertionError("mismatched new_lines and annotated_lines")
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    # First compare the newly annotated lines with the right annotated lines.
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    # Lines which were not changed in left or right should match. This tends to
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    # be the bulk of the lines, and they will need no further processing.
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        last_right_idx = right_idx + match_len
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        last_left_idx = left_idx + match_len
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        # If left and right agree on a range, just push that into the output
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        assert len(lines) == left_idx
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        lines_extend(annotated_lines[left_idx:left_idx + match_len])
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    return lines