Weired side-effect of using the remap feature in keymaps

[Carsten Dominik]

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

I would like to report a weired bug that looks like a side effect of
using the remap feature for keymaps.  This bug waas discovered
by Thomas Baumann (cc on this email) while using Org-mode, but
as I show below it is not related to Org-mode but to the
internalremapping feature for keymaps.

Here is what you need to do in order to reproduce the bug:

1. Start Emacs with emacs -Q

2. Evaluate the following Lisp code:

        ;; Define a keymap
        (defvar my-dummy-map (make-keymap))

        ;; Now use the remap feature to remap delete-backward-char
        (define-key my-dummy-map
          (vector 'remap 'delete-backward-char) 'backward-char)

        ;; Create a buffer and actually install that map.  This step
        ;; seems to be necessary for the bug to occcur.
        (switch-to-buffer (get-buffer-create "foo"))
        (use-local-map my-dummy-map)

3. Now, start calc with `M-x calc RET'.

4. If you now check the definition of the DEL key, for example with
   `C-h k DEL', you will see that in calc-mode, this key is now bound
   to `backward-char', even though the remapping was done in
   `my-dummy-map'.  When calc binds the DEL key, it actually scans the
   global map for any key bound to `delete-backward-char' using

     (where-is-internal 'delete-backward-char global-map)

   This search seems to fail after the code above, i.e. something
   seems to have changed in global map which should not have changed.


I hope this is enough to put someone on the trail of this bug.

Thanks!

- Carsten Dominik


In GNU Emacs 22.0.95.1 (powerpc-apple-darwin7.9.0, X toolkit)
 of 2007-03-19 on nb-dominik2.science.uva.nl
Windowing system distributor `The XFree86 Project, Inc', version 
11.0.40300000
configured using `configure  '--with-x''

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

Major mode: Emacs-Lisp

Minor modes in effect:
  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
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <menu-bar> <help-menu> <report-emacs-b
ug>

Recent messages:
(ne -Q testcalc.el)
For information about the GNU Project and its goals, type C-h C-p.
Loading vc-svn...done
Loading vc...
Loading easymenu...done
Loading vc...done
Loading emacsbug...
Loading regexp-opt...done
Loading emacsbug...done