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+1.

minor nits:

in the main patch: instead of

+            if line.endswith('\n'):
+                last_line_lfend = True
+            else:
+                last_line_lfend = False

you can just use

  last_line_lfend = line.endswith('\n')

in the unit test: instead of

  if type(a) != type(0):

use

  if not isinstance(a, int):

so that if some future release changes file.closed to return
a bool (as it should :-) this test won't break.

Is tehre a reason why you're not patching the fp.readline()
call in parse_multipart()?  It would seem to have the same
issue (even if it isn't used in Zope :-).