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 Thu, 22 Aug 2024 15:04:56 +0300, Björn Bidar <bjorn.bidar@thaodan.de> said:

    Björn> Robert Pluim <rpluim@gmail.com> writes:
    >>>>>>> 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.

    Björn> If there would be an easy way to new prefix to the ignore list that
    Björn> would work. Can't expect (avarage) users to build their regular
    Björn> expression especially when multiple languages are involved.

The new defcustom could be a list of regexps, ie

  ("RE" "R\u00c9\\.?" "FWD?" "رد" "回复" "回覆" "SV" "Antw\\.?"
  "VS" "REF" "AW" ΑΠ" "ΣΧΕΤ" "השב" "Vá" "R" "RIF" "BLS" "RES"
  "Odp" "YNT" "ATB")

which weʼd concatenate with "\\|" to get the real regexp. That would
be quite easy to edit in custom.

Robert
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