bug#72442: 31.0.50; Gnus or message.el doesn't handle international message reply subject prefixes and insults users

[Robert Pluim <rpluim@gmail.com>]

>>>>> On Tue, 20 Aug 2024 15:56:24 +0200, Robert Pluim <rpluim@gmail.com> said:

    Robert> The first is easy. The second is a bit more difficult, since the two
    Robert> donʼt cover exactly the same cases, and message matches
    Robert> case-sensitively, unlike rmail, so weʼd need to either adapt eg "ΣΧΕΤ" to
    Robert> "[Σσ][Χχ][Εε][Ττ]" or make the breaking change of binding
    Robert> `case-fold-search' in message. Personally Iʼd prefer the latter.

    Robert> (are there really mailers that prefix the subject with "R:"?)

The current setting for rmail is more complete than the suggestion in
the Gnus manual, except itʼs missing:

- "RÉ"
- an optional "." after "Antw"
- an optional space between the "RE" string and the ":"
- "FW"/"FWD"

The first 3 seem obvious. Adding the last might annoy people :-)

I can add those to `rmail-re-abbrevs', but perhaps itʼs better to have a
new defcustom that both rmail and message would use? Something like
'mail-re-regexps' in "mail-utils.el" perhaps? Plus some appropriate
editing of the manual.

Robert
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