bug#2286: 23.0.60; Emacs.app cannot display Thai characters with vowels

[Kridsada Thanabulpong]

Built Emacs.app from source (via MacPorts) and it can no longer
correctly display Thai characters.

1. Switch to anything other than fundamental-mode.
2. Type (or copy) Thai text with vowels, e.g. ไก่จิกเด็กตายบนปากโอ่ง
3. Characters with vowels all mysteriously disappeared.

This used to work on Emacs.app rc3 build posted on http://emacs-app.sf.net/.
Don't know if this is a related issue, but Japanese font substitution
is also wrong (font look funny, unlike in the rc3 build.)


In GNU Emacs 23.0.60.1 (powerpc-apple-darwin9.6.0, NS apple-appkit-949.43)
 of 2009-02-11 on Dice.localhost
Windowing system distributor `Apple', version 10.3.949
configured using `configure  '--prefix=/opt/local' '--with-ns'
'CC=/usr/bin/gcc-4.0' 'CFLAGS=-O2' 'LDFLAGS=-L/opt/local/lib'
'CPPFLAGS=-I/opt/local/include' 'CPP=/usr/bin/cpp-4.0''

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
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  global-auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x r e p o r t <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.