23.0.60; Can't set fontset font for unicode line drawing characters

23.0.60; Can't set fontset font for unicode line drawing characters

[David Hansen]

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug@gnu.org mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Hello,

Note that this may not be a bug but insufficient knowledge about
fontsets on my side.

Emacs insist on choosing a double width font to display unicode line
drawing characters.

I tried

(set-fontset-font "fontset-monaco"
                  '(#x2000 . #x27FF)
                  '("DejaVu Sans Mono" . "iso10646-1"))

and

(set-fontset-font "fontset-monaco"
                  '(#x2000 . #x27FF)
                  "-*-dejavu sans mono-*-*-*-*-*-*-*-*-*-*-iso10646-1")

but emacs still insists on using some other font.  The characters are
in the DejaVu fonts.  Here is the output of C-u C-x =:


        character: │ (9474, #o22402, #x2502)
preferred charset: unicode (Unicode (ISO10646))
       code point: 0x2502
           syntax: _ 	which means: symbol
         category: a:ASCII graphic characters 32-126 (ISO646 IRV:1983[4/0])
                   c:Chinese h:Korean j:Japanese
      buffer code: #xE2 #x94 #x82
        file code: #xE2 #x94 #x82 (encoded by coding system utf-8-unix)
          display: by this font (glyph code)
     -ISAS-Song ti-Medium-R-Normal--16-160-72-72-c-160-GB2312.1980-0 (#x2926)

Character code properties: customize what to show
  general-category: So (Symbol, Other)
  name: BOX DRAWINGS LIGHT VERTICAL

There is an overlay here:
 From 1 to 61
  face                 hl-line
  window               nil


There are text properties here:
  auto-composed        t
  face                 dh-gnus-face-3
  gnus-face            t
  gnus-number          421
  mouse-face           highlight



If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/home/dhansen/share/emacs/23.0.60/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.6 (i686-pc-linux-gnu, GTK+ Version 2.12.9)
 of 2008-04-15 on robotron
Windowing system distributor `The X.Org Foundation', version 11.0.10400090
configured using `configure  '--prefix=/home/dhansen' '--disable-sound' '--disable-pop' '--without-gpm' '--without-toolkit-scroll-bars''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.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:
  eldoc-mode: t
  paredit-mode: t
  global-visible-mark-mode: t
  visible-mark-mode: t
  which-function-mode: t
  show-paren-mode: t
  iswitchb-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-compression-mode: t
  line-number-mode: t
  abbrev-mode: 1

Recent input:
C-n C-n C-n C-n C-n C-n C-x C-e C-p C-p C-p C-p C-p 
C-a C-M-k <backspace> C-n C-n C-n C-x C-s C-g <S-down-mouse-1> 
C-x v C-x b C-x b g r o <return> g C-p RET C-n RET 
M-u C-p C-f C-f C-b C-u C-x = q q C-h i M-< l l l C-p 
C-p C-p C-p C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f 
C-a C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-x 
2 C-x b s c r <return> C-p C-p ( m o d i f y - c a 
t e o <backspace> g o r y - <M-tab> SPC C-p C-p M-b 
C-b C-M-SPC M-w C-n C-n C-e C-b C-y SPC M-x l i s t 
- c a t <tab> <M-backspace> <M-backspace> c a t e <tab> 
C-g C-x o C-g C-x o C-x o M-p M-p <return> C-x o C-s 
s y n C-a C-v C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-n C-n C-n C-p C-p C-p C-x o ? a C-e 
C-x C-e C-x b g <return> M-> C-p C-p C-p C-p C-p C-p 
RET C-f C-u C-x = q C-x b <return> C-p C-e <return> 
C-n C-e <down-mouse-4> <mouse-4> <down-mouse-5> <mouse-5> 
<down-mouse-4> <mouse-4> <double-down-mouse-4> <double-mouse-4> 
C-x b g r o <return> g C-p C-p C-p C-p C-p C-p M-< 
C-n C-n RET d q g C-p C-p C-p C-p M-g C-p C-p C-p C-p 
RET c y C-n C-n C-n C-n RET C-n C-n C-f C-f C-f C-f 
C-f C-f C-f C-f C-f C-f C-f C-n C-f C-b C-b C-b q C-x 
b s c r <return> C-p C-p C-p C-p C-p C-p C-p M-x r 
e p <tab> o r <tab> b u <tab> <return>

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