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(vila) Do not show exception to user on pointless commit error. (Jonathan
 Riddell)

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    :param to_file: A file-like object to which messages will be sent.
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    :returns: A memento that should be passed to _pop_log_file to restore the
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        previously active logging.
 
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    previously active logging.
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    """
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    global _trace_file
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    # make a new handler