M-x moves over prefix text in minibuffer

[Jonathan Kamens]

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In GNU Emacs 21.1.1 (i386-redhat-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2001-12-06 on stripples.devel.redhat.com
configured using `configure  i386-redhat-linux --prefix=/usr --exec-prefix=/usr 
--bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share 
--includedir=/usr/include --libdir=/usr/lib --libexecdir=/usr/libexec 
--localstatedir=/var --sharedstatedir=/usr/com --mandir=/usr/share/man 
--infodir=/usr/share/info --with-gcc --with-pop --with-sound'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  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: t

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

Type M-x, then type M-x, and your cursor moves back over the 'x' in
"M-x" in the minibuffer.  Then when you try to type a command, you get
"Text is read-only".  You shouldn't be able to move the cursor back
onto the prefix or prompt text in the minibuffer.  In Emacs 20, you
can't.

  jik