bug#17148: 23.1; Revert Buffer

[Joe Camaioni <jcamaion@tbfmdev1.ctasdev.tc.faa.gov>]

A buffer has been loaded with a file.  It is initially unwritable.  A chmod is performed in a shell window to make it writable.  Going into the File menu pulldown, the Revert Buffer stays gray-ed out, and the file is still listed as unwritable.  


In GNU Emacs 23.1.1 (x86_64-redhat-linux-gnu, GTK+ Version 2.18.9)
 of 2011-02-01 on x86-003.build.bos.redhat.com
Windowing system distributor `The X.Org Foundation', version 11.0.60900000
configured using `configure  '--build=x86_64-redhat-linux-gnu' '--host=x86_64-redhat-linux-gnu' '--target=x86_64-redhat-linux-gnu' '--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64' '--libexecdir=/usr/libexec' '--localstatedir=/var' '--sharedstatedir=/var/lib' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--with-dbus' '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff' '--with-xft' '--with-xpm' '--with-x-toolkit=gtk' 'build_alias=x86_64-redhat-linux-gnu' 'host_alias=x86_64-redhat-linux-gnu' 'target_alias=x86_64-redhat-linux-gnu' 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector 
 --param=ssp-buffer-size=4 -m64 -mtune=generic''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  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.iso88591
  value of $XMODIFIERS: nil
  locale-coding-system: iso-latin-1-unix
  default-enable-multibyte-characters: t

Major mode: Tcl

Minor modes in effect:
  text-scale-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
nd-emacs-bug-report>

Recent messages:
Cannot write backup file; backing up in /home/jcamaion/%backup%~
Wrote /home/vobadm/bin/AR_QA_pkg.exp
Saving file /home/vobadm/bin/AR_QA_pkg.exp...
Wrote /home/vobadm/bin/AR_QA_pkg.exp
Note: file is write protected
Mark saved where search started
Note: file is write protected
Buffer is read-only: #<buffer AP_QA_tar.exp>
Mark saved where search started
call-interactively: Text is read-only