dired and arc-mode don't bind C-/ to undo (w/ patch)

[John Hawkinson <jhawk@MIT.EDU>]

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In GNU Emacs 21.3.1 (sparc-sun-solaris2.9, X toolkit)
 of 2004-10-27 on downy.mit.edu
configured using `configure  --with-x-toolkit --sharedstatedir=/var/tmp --with-pop --with-hesiod --with-kerberos'
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: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

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

    I tried to undo an accidental typo ("k") in dired mode,
and discovered that while C-x u and C-_ are bound to dired-undo,
C-/ is not. This is awful confusing since for many users,
C-/ is the most-remembered undo binding, because it is easy
to type.

    arc-mode appears to have the same problem. Here's a patch
to rebind C-/ locally in dired and arc-mode. I think the 
current behavior is confusing and undesirable, and I do not
think anyone is depending on it.

Thanks.

--jhawk@mit.edu
  John Hawkinson

diff -ur ./arc-mode.el /tmp/emacs/arc-mode.el
--- ./arc-mode.el	Wed Oct 27 00:29:24 2004
+++ /tmp/emacs/arc-mode.el	Mon Jan 24 20:53:38 2005
@@ -605,7 +605,8 @@
       (progn
 	;; Not a nice "solution" but it'll have to do
 	(define-key archive-mode-map "\C-xu" 'archive-undo)
-	(define-key archive-mode-map "\C-_" 'archive-undo))
+	(define-key archive-mode-map "\C-_" 'archive-undo)
+	(define-key archive-mode-map [?\C-/] 'archive-undo))
     (substitute-key-definition 'undo 'archive-undo
 			       archive-mode-map global-map))
 
diff -ur ./dired.el /tmp/emacs/dired.el
--- ./dired.el	Wed Oct 27 00:29:24 2004
+++ /tmp/emacs/dired.el	Mon Jan 24 20:54:01 2005
@@ -979,6 +979,7 @@
     (define-key map "\177" 'dired-unmark-backward)
     (define-key map "\C-_" 'dired-undo)
     (define-key map "\C-xu" 'dired-undo)
+    (define-key map [?\C-/] 'dired-undo)
 
     ;; Make menu bar items.