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single-key-description no good for Japanese and Chinese chars

From: Drew Adams
Subject: single-key-description no good for Japanese and Chinese chars
Date: Wed, 20 Sep 2006 11:17:52 -0700

`single-key-description' returns the exact same key description for
each key in the asian character sets (Japanese, Chinese, etc.).

For example, for the different input events (keys) 20864 and 20992,
the exact same description is given: "Character set JISX0208.1978
(Japanese): ISO-IR-42".

This is useless. The single-key description must be unique for a given
key. If nothing else, the event value should be included in the
description: e.g. "Character set JISX0208.1978 (Japanese): ISO-IR-42 -

I have code, for instance, that lets you complete key sequences.  The
completion candidates are the `single-key-descriptions' of the key
sequences typed so far.  At top level, they are the descriptions of
all top-level bindings and commands.  For example, this is a possible

 "a = self-insert-command"

And so is this:

 "Character set JISX0208.1978 (Japanese): ISO-IR-42" = self-insert-command"

And this:

 "Character set Big5 (Level-1) A141-C67F = self-insert-command"

However, *all* characters in each of those Japanese and Chinese
character sets have the exact same key description, so there is no way
to understand which character corresponds to which description
(i.e. completion candidate) - they are all the same.

In sum, the `single-key-description' is not a key description at all
in these cases; it is a character-set description.  Each key
description should be unique.  Imagine if all ASCII characters had the
same key description: "ASCII character set" - you can see that it
would be useless.

In GNU Emacs (i386-msvc-nt5.1.2600)
 of 2006-07-19 on BOS-CTHEWLAP2
X server distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-msvc (12.00)'

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: ENU
  locale-coding-system: cp1252
  default-enable-multibyte-characters: t

Major mode: Dired by name

Minor modes in effect:
  encoded-kbd-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
  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> <menu-bar>
<help-menu> <report-emacs-bug>

Recent messages:
(C:\Emacs-22-2006-07-19-Fran\bin\emacs.exe -q --no-site-file --debug-init
Loading encoded-kb...done
For information about the GNU Project and its goals, type C-h C-p.
Loading dired...
Loading regexp-opt...done
Loading dired...done
Loading emacsbug...done

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