#1116: threading broken with odd Message-ID:
Comment (by pdmef):
Looking at the code, I think the problem is this: when parsing References
/In-Reply-To headers of messages referring to a Message-ID with spaces,
all spaces are gone since mutt uses strtok(" \t;") to separate words in
these headers.
Of course, mutt could parse these by looking for '<' and '>' and possibly
filter out bad characters in between... but given that spaces there aren't
legal and it's a rather rare edge-case, I don't think it's really worth
changing the parser.
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Ticket URL: <http://dev.mutt.org/trac/ticket/1116#comment:12>
