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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: Gathering very loose threads
Date: Thu, 16 May 2002 16:58:12 +0200
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In-Reply-To: <wtnn0v0dwfr.fsf@licia.dtek.chalmers.se> (Jonas Steverud's
 message of "Thu, 16 May 2002 16:00:40 +0200")
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Jonas Steverud <d4jonas@dtek.chalmers.se> writes:

> Simon Josefsson <jas@extundo.com> writes:
>
>> Does this work as a member of gnus-simplify-subject-functions?
>
> There are already a function for this; gnus-simplify-whitespace.

I believe that function only removes excessive whitespace, not all
whitespace.  Compare

(gnus-simplify-whitespace " foo bar ")
"foo bar"

with

((lambda (str)
  (with-temp-buffer
    (insert str)
    (goto-char (point-min))
    (while (re-search-forward " +" nil t)
      (replace-match ""))
    (buffer-string)))
 " foo bar ")
"foobar"

The latter looks generally useful, so I added it as
gnus-simplify-all-whitespace.  Perhaps it should even be used by
default (whitespace in Subject: is rarely useful for threading
purposes), but I'll leave it for someone else to make that patch.