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Ah, I take it back. With \n it retains the \n in the decoded name field.
There is a bug of some sort here (\r\n should be treated the same as \n, I think, whatever way it is treated). I don't think this is worth addressing, given that the new policies provide a much better API for interacting with Messages, and you can in fact easily unfold the line before parsing it if you need to do it in 2.7:
 >>> parseaddr(''.join(m['from'].splitlines()))
 ('=?UTF-8?Q?Anita_=W4=86ieckli=C5=84ska_|_PATO_Nieruch?= =?UTF-8?Q?omo=C5=9Bci?=', 'anita.wiecklinska@pato.com.pl')