bug#24972: 26.0.50; Multibyte characters are misaligned in ibuffer

[Liu Hui <liuhui1610@gmail.com>]

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Hello,

As shown in the screenshot attached, multibyte characters (the second 
line) are misaligned in ibuffer. The problem seems at least relevant to 
the function `ibuffer-compile-format', which uses `length' rather than 
`string-width' for characters.


In GNU Emacs 26.0.50.2 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
  of 2016-10-26 built on lcy01-25
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:	Ubuntu 16.04.1 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Updating buffer list...
Formats have changed, recompiling...done
Updating buffer list...done
Commands: m, u, t, RET, g, k, S, D, Q; q to quit; h for help

Configured using:
  'configure --build=x86_64-linux-gnu --prefix=/usr
  '--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
  '--infodir=${prefix}/share/info' --sysconfdir=/etc --localstatedir=/var
  --disable-silent-rules '--libdir=${prefix}/lib/x86_64-linux-gnu'
  '--libexecdir=${prefix}/lib/x86_64-linux-gnu' --disable-maintainer-mode
  --disable-dependency-tracking --prefix=/usr --sharedstatedir=/var/lib
  --program-suffix=-snapshot --with-modules=yes --with-x=yes
  --with-x-toolkit=gtk3 --with-xwidgets=yes 'CFLAGS=-g -O2
  -fstack-protector-strong -Wformat -Werror=format-security'
  'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
  'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES XWIDGETS LIBSYSTEMD

Important settings:
   value of $LANG: zh_CN.UTF-8
   value of $XMODIFIERS: @im=fcitx
   locale-coding-system: utf-8-unix

Major mode: IBuffer

Minor modes in effect:
   tooltip-mode: t
   global-eldoc-mode: t
   electric-indent-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
   buffer-read-only: t
   line-number-mode: t
   transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message subr-x puny dired dired-loaddefs
format-spec rfc822 mml mml-sec password-cache epa derived epg epg-config
gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mail-utils ibuf-ext ibuffer
ibuffer-loaddefs seq byte-opt gv bytecomp byte-compile cl-extra
help-mode easymenu cconv cl-loaddefs pcase cl-lib time-date mule-util
china-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list newcomment elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese charscript case-table epa-hook jka-cmpr-hook help simple abbrev
obarray minibuffer cl-preloaded 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
dbusbind inotify dynamic-setting system-font-setting font-render-setting
xwidget-internal move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 106143 9040)
  (symbols 48 21101 0)
  (miscs 40 546 154)
  (strings 32 20160 4361)
  (string-bytes 1 648450)
  (vectors 16 15319)
  (vector-slots 8 526212 5865)
  (floats 8 186 176)
  (intervals 56 401 8)
  (buffers 976 14)
  (heap 1024 32825 1228))


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