bug#2190: 23.0.90; Repeated composed characters are displayed wrong.

Steps to reproduce:
  1. $ emacs -Q
  2. (insert 101 769 101 769 101 769) C-j

Result:
  Only one composed character is shown.

				     YAMAMOTO Mitsuharu
				[email protected]

In GNU Emacs 23.0.90.1 (powerpc-apple-darwin9.6.0, X toolkit)
 of 2009-02-04 on yamamoto-mitsuharu-no-power-mac-g5.local
Windowing system distributor `The X.Org Foundation', version 11.0.10300000
configured using `configure  '--without-jpeg' '--without-gif' '--without-tiff''

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: ja_JP.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

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
  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