case conversion by replace-match

[Roland Winkler]

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In GNU Emacs 21.2.1 (i386-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-04-09 on tfkp12
configured using `configure  --prefix=/nfs/common --libexecdir=/nfs/common/lib 
--bindir=/nfs/common/lib/emacs/21.2/bin/i686-Linux 
--mandir=/nfs/common/share/man --infodir=/nfs/common/share/info --with-gcc 
--with-pop --with-x --with-x-toolkit=athena i386-pc-linux'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: POSIX
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: nil

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:


Start a fresh emacs --no-init-file

define the following function

(defun foo ()
  (interactive)
  (let (case-fold-search)
    (while (search-forward "=FC" nil t)
      (replace-match (string 252) nil t))))

`(string 252)' gives a lowercase umlaut-u (iso-latin-1)

However, when foo is run in a buffer containing the string "=FC",
this string will be replaced with an uppercase umlaut-U.

PS In mime-encoded mails "=FC" represents a lowercase umlaut-u.
PPS Same problem with GNU Emacs 21.3.50.2.