string-width() vs composite strings

[山本和彦]

Hello, 

string-width() returns a wrong number if its argument string
has composite characters.

Consider two bytes strings 0xcd 0xeb, whose width is one since they
are composed.

On Emacs 20.7 string-width() returns 1.
On Emacs 21.3.50 string-width() returns 2.

--Kazu

In GNU Emacs 21.3.50.1 (i386-unknown-netbsdelf1.6U, X toolkit, Xaw3d scroll 
bars)
 of 2003-07-31 on caster.iij.ad.jp
configured using `configure '--without-xim' '--prefix=/usr/local/emacs21''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: ja_JP.eucJP
  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: japanese-iso-8bit
  default-enable-multibyte-characters: t

Recent input:
C-p SPC o <return> x s <return> w C-c C-q y s C-g s 
<return> SPC d x C-x b * s TAB <return> C-x b <return> 
C-p C-p C-p C-p g + i b DEL n b TAB <return> C-p C-f 
C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f 
C-SPC C-f ESC w C-x C-f t i s <return> C-y C-x C-s 
t h i TAB DEL DEL i s TAB - TAB <return> C-z m d x 
ESC x r e p o t DEL r t SPC SPC SPC b SPC <return>

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