bug#15273: 24.3.50; Combining character sequences are displayed weirdly

[Xue Fuqiao]

To reproduce:

  emacs -Q
  !                      ;; input an exclamation mark (#x21)
  C-x 8 RET 2 0 E 4 RET  ;; COMBINING ENCLOSING UPWARD POINTING TRIANGLE
  RET                    ;; Newline
  C-x 8 2 6 A 0 RET      ;; WARNING SIGN

I tried many fonts, but all results look weird (the first line is
incomplete and too large).

(I haven't tried it on other platforms yet, so I'm not sure whether it's
NS-port specific.)

In GNU Emacs 24.3.50.1 (x86_64-apple-darwin12.4.0, NS apple-appkit-1187.39)
 of 2013-08-31 on xfq.local
Bzr revision: 114077 rgm@gnu.org-20130830174039-3aiddsbwhbn5tf9x
Windowing system distributor `Apple', version 10.3.1187
Configured using:
 `configure --with-ns --enable-checking --disable-silent-rules'

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

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

Recent input:
! C-x 8 <return> 2 0 e 4 <return> <return> C-x 8 <return>
2 6 a 0 <return> <escape> x r e - e m - m <backspace>
b <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
read-number: Command attempted to use minibuffer while in minibuffer

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr misearch multi-isearch emacsbug message
format-spec rfc822 mml easymenu mml-sec mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils iso-transl time-date
tooltip ediff-hook vc-hooks lisp-float-type mwheel ns-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process ns
multi-tty emacs)


-- 
Best regards, Xue Fuqiao.
http://www.gnu.org/software/emacs/

combining-character-sequences.png
Description: PNG image