[Mailman-Developers] Patch for non-ASCII characters in Subject line

[Johan Holmberg]

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Hello mailman-developers !

I have for a long time been annoyed by the fact that Mailman adds
more than one copy of the mailing-list-prefix to the Subject line in
replies sent to a list. This can occur if the Subject line contains
non-ASCII characters (this has been reported in the bug-database
as bug #230400: "German Umlaute mess up subject-line and body").
It looks something like (if you can view this in your mailers :-)):

       Subject: Re: [Test] Re: [Test] r=E4kms=F6rg=E5s

The reason seems to be that Mailman has the following "algorithm" to
decide what to do:

    - add list-name-prefix (if it isn't already there)

instead of the more correct:

    - MIME-decode the subject
    - add list-name-prefix (if it isn't already there)
    - MIME-reencode the subject

If no MIME-decoding is done, Mailman can fail to detect the precense
of a mailing-list-prefix, since the prefix can be "buried" in the
MIME-encoded stuff.

I have made a patch to "CookHeaders.py" that fixes this problem, and
implements the second alternative above (see the attached patch).

Could something like this be added to future versions of Mailman ??
(I don't know if I have made the change the right way (I'm not a
Python programmer)).

/Johan Holmberg


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