GNU logs - #29631, boring messages

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Subject: bug#29631: 25.3; Unable to use custom fontset as frame default font
Resent-From: Thomas Morgan <tlm@HIDDEN>
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From: Thomas Morgan <tlm@HIDDEN>
Date: Sat, 09 Dec 2017 16:32:39 -0500
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I started Emacs with `emacs -Q', entered the following expression
in *scratch*, and evaluated it with C-M-x:

  (progn
    ;; Create a new fontset called fontset-liberation.
    (create-fontset-from-fontset-spec
     "-*-Liberation Mono-normal-normal-normal-*-*-*-*-*-m-0-fontset-liberat=
ion")

    ;; Set its primary font to Liberation Mono.
    (set-fontset-font "fontset-liberation" 'unicode-bmp "Liberation Mono")

    ;; Add a fallback to Freemono for characters that Liberation Mono lacks.
    (set-fontset-font "fontset-liberation" 'unicode-bmp "Freemono:size=3D40"
                      nil 'append)

    ;; Set the frame's default font to the new fontset.

    (set-face-font 'default "fontset-liberation")

    ;; Return font objects for "a", an ASCII character that Liberation Mono=
 has,
    ;; and "=C8=B7" (LATIN SMALL LETTER DOTLESS J), a character in Freemono=
 but
    ;; not in Liberation Mono.
    (list (font-at 0 nil "a") (font-at 0 nil "=C8=B7")))

The result was this:

  (#<font-object "-1ASC-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0=
-iso10646-1">
   #<font-object "-1ASC-Liberation Serif-normal-normal-normal-*-15-*-*-*-*-=
0-iso10646-1">)

The font for ASCII character "a" was Liberation Mono as expected, but
I expected the second font to be Freemono and it was Liberation Serif.

I checked which fontset is being used as default:

  (face-attribute 'default :fontset)

It's fontset-auto1, not fontset-liberation:

  "-1ASC-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0-fontset-auto1"

I typed `M-x describe-fontset RET fontset-auto1 RET'.

  Fontset: -1ASC-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0-fontse=
t-auto1
  CHAR RANGE (CODE RANGE)
      FONT NAME (REQUESTED and [OPENED])
  C-@ .. =C2=9F (#x43 .. #x9F)
      -*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1
  =C2=A0 .. =C9=8F (#xA0 .. #x24F)
      -*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1
          [-1ASC-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0-iso106=
46-1]
          [-1ASC-Liberation Serif-normal-normal-normal-*-15-*-*-*-*-0-iso10=
646-1]
  =C9=90 .. [#x3FFF7F] (#x250 .. #x3FFF7F)
      -*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1
  [\200] .. [\377] (#x3FFF80 .. #x3FFFFF)
      -*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1

    ---<fallback to the default fontset>---
  [...]

(Non-UTF8 characters are replaced with representations in brackets.)

So fontset-auto1 includes Liberation Serif but not Freemono.
fontset-auto1 seems to be generated from fontset-liberation's primary
font without regard for its fallback fonts.

To test whether changing the fallback font in fontset-auto1 has
an effect, I restarted Emacs with `emacs -Q' and evaluated the
following expression, which modifies fontset-auto1 instead of
fontset-liberation.

  (progn
    ;; Create a new fontset called fontset-liberation.
    (create-fontset-from-fontset-spec
     "-*-Liberation Mono-normal-normal-normal-*-*-*-*-*-m-0-fontset-liberat=
ion")

    ;; Set the frame's default font to the new fontset.
    (set-face-font 'default "fontset-liberation")

    ;; Set the frame's primary font to Liberation Mono.
    (set-fontset-font "fontset-auto1" 'unicode-bmp "Liberation Mono")

    ;; Add a fallback to Freemono for characters that Liberation Mono lacks.
    (set-fontset-font "fontset-auto1" 'unicode-bmp "Freemono:size=3D40"
                      nil 'append)

    ;; Return font objects for "a", an ASCII character that Liberation Mono=
 has,
    ;; and "=C8=B7" (LATIN SMALL LETTER DOTLESS J), a character in Freemono=
 but
    ;; not in Liberation Mono.
    (list (font-at 0 nil "a") (font-at 0 nil "=C8=B7")))

This changed the font for the non-ASCII character to Freemono
and returned what I expected:

  (#<font-object "-1ASC-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0=
-iso10646-1">
   #<font-object "-GNU -FreeMono-normal-normal-normal-*-40-*-*-*-m-0-iso106=
46-1">)

(Incidentally, evaluating the above progn without restarting Emacs
causes a core dump, but I have a smaller test case for that and I'll
make another report about it.)

It looks as if fontset-auto1 is generated by fontset_from_font
in fontset.c, but I don't understand why the specified fontset
(fontset-liberation) is not used and I haven't been able to find
anything in the manual that clarifies this behavior.  I'd like
to know how to use a custom fontset for a frame's default face
(and for other faces), but if that's not supported, this may be
a documentation bug.

Information from report-emacs-bug:

In GNU Emacs 25.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.21)
 of 2017-11-05 built on localhost
Windowing system distributor 'The X.Org Foundation', version 11.0.11905000
Configured using:
 'configure --disable-dependency-tracking
 --prefix=3D/nix/store/7px74nmmy9wnl594jsk0lcgz1ygsbwfj-emacs-25.3
 --with-modules --with-x-toolkit=3Dgtk3 --with-xft'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND DBUS GSETTINGS NOTIFY LIBSELINUX GNUTLS
LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

Important settings:
  value of $LC_ALL: en_US.utf8
  value of $LC_COLLATE: C
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=3Dibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

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
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Mark set
(#<font-object "-1ASC-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0-i=
so10646-1"> #<font-object "-GNU -FreeMono-normal-normal-normal-*-40-*-*-*-m=
-0-iso10646-1">)

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec password-cache epg epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns help-mode easymenu
cl-loaddefs pcase cl-lib mail-prsvr mail-utils time-date mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel 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 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 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 move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 87168 5967)
 (symbols 48 19960 0)
 (miscs 40 56 121)
 (strings 32 14566 4561)
 (string-bytes 1 435478)
 (vectors 16 11914)
 (vector-slots 8 439170 4779)
 (floats 8 166 74)
 (intervals 56 242 21)
 (buffers 976 18))

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Thomas Morgan <tlm@HIDDEN>
Subject: bug#29631: Acknowledgement (25.3; Unable to use custom fontset as
 frame default font)
Message-ID: <handler.29631.B.151285562917647.ack <at> debbugs.gnu.org>
References: <87shcjsi2w.fsf@HIDDEN>
X-Gnu-PR-Message: ack 29631
X-Gnu-PR-Package: emacs
Reply-To: 29631 <at> debbugs.gnu.org
Date: Sat, 09 Dec 2017 21:41:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#29631: 25.3; Unable to use custom fontset as frame default font
Resent-From: Eli Zaretskii <eliz@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-gnu-emacs@HIDDEN
Resent-Date: Sun, 10 Dec 2017 17:29:01 +0000
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Resent-Sender: help-debbugs@HIDDEN
To: Thomas Morgan <tlm@HIDDEN>, Kenichi Handa <handa@HIDDEN>
Cc: 29631 <at> debbugs.gnu.org
Reply-To: Eli Zaretskii <eliz@HIDDEN>
Date: Sun, 10 Dec 2017 19:28:04 +0200
Message-Id: <83d13mtrvf.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-reply-to: <87shcjsi2w.fsf@HIDDEN> (message from Thomas Morgan on Sat, 09
 Dec 2017 16:32:39 -0500)
References: <87shcjsi2w.fsf@HIDDEN>
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> From: Thomas Morgan <tlm@HIDDEN>
> Date: Sat, 09 Dec 2017 16:32:39 -0500
> 
> I started Emacs with `emacs -Q', entered the following expression
> in *scratch*, and evaluated it with C-M-x:
> 
>   (progn
>     ;; Create a new fontset called fontset-liberation.
>     (create-fontset-from-fontset-spec
>      "-*-Liberation Mono-normal-normal-normal-*-*-*-*-*-m-0-fontset-liberation")
> 
>     ;; Set its primary font to Liberation Mono.
>     (set-fontset-font "fontset-liberation" 'unicode-bmp "Liberation Mono")
> 
>     ;; Add a fallback to Freemono for characters that Liberation Mono lacks.
>     (set-fontset-font "fontset-liberation" 'unicode-bmp "Freemono:size=40"
>                       nil 'append)
> 
>     ;; Set the frame's default font to the new fontset.
> 
>     (set-face-font 'default "fontset-liberation")
> 
>     ;; Return font objects for "a", an ASCII character that Liberation Mono has,
>     ;; and "ȷ" (LATIN SMALL LETTER DOTLESS J), a character in Freemono but
>     ;; not in Liberation Mono.
>     (list (font-at 0 nil "a") (font-at 0 nil "ȷ")))
> 
> The result was this:
> 
>   (#<font-object "-1ASC-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0-iso10646-1">
>    #<font-object "-1ASC-Liberation Serif-normal-normal-normal-*-15-*-*-*-*-0-iso10646-1">)
> 
> The font for ASCII character "a" was Liberation Mono as expected, but
> I expected the second font to be Freemono and it was Liberation Serif.
> 
> I checked which fontset is being used as default:
> 
>   (face-attribute 'default :fontset)
> 
> It's fontset-auto1, not fontset-liberation:
> 
>   "-1ASC-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0-fontset-auto1"
> 
> I typed `M-x describe-fontset RET fontset-auto1 RET'.
> 
>   Fontset: -1ASC-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0-fontset-auto1
>   CHAR RANGE (CODE RANGE)
>       FONT NAME (REQUESTED and [OPENED])
>   C-@ ..  (#x43 .. #x9F)
>       -*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1
>     .. ɏ (#xA0 .. #x24F)
>       -*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1
>           [-1ASC-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0-iso10646-1]
>           [-1ASC-Liberation Serif-normal-normal-normal-*-15-*-*-*-*-0-iso10646-1]
>   ɐ .. [#x3FFF7F] (#x250 .. #x3FFF7F)
>       -*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1
>   [\200] .. [\377] (#x3FFF80 .. #x3FFFFF)
>       -*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1
> 
>     ---<fallback to the default fontset>---
>   [...]
> 
> (Non-UTF8 characters are replaced with representations in brackets.)
> 
> So fontset-auto1 includes Liberation Serif but not Freemono.
> fontset-auto1 seems to be generated from fontset-liberation's primary
> font without regard for its fallback fonts.
> 
> To test whether changing the fallback font in fontset-auto1 has
> an effect, I restarted Emacs with `emacs -Q' and evaluated the
> following expression, which modifies fontset-auto1 instead of
> fontset-liberation.
> 
>   (progn
>     ;; Create a new fontset called fontset-liberation.
>     (create-fontset-from-fontset-spec
>      "-*-Liberation Mono-normal-normal-normal-*-*-*-*-*-m-0-fontset-liberation")
> 
>     ;; Set the frame's default font to the new fontset.
>     (set-face-font 'default "fontset-liberation")
> 
>     ;; Set the frame's primary font to Liberation Mono.
>     (set-fontset-font "fontset-auto1" 'unicode-bmp "Liberation Mono")
> 
>     ;; Add a fallback to Freemono for characters that Liberation Mono lacks.
>     (set-fontset-font "fontset-auto1" 'unicode-bmp "Freemono:size=40"
>                       nil 'append)
> 
>     ;; Return font objects for "a", an ASCII character that Liberation Mono has,
>     ;; and "ȷ" (LATIN SMALL LETTER DOTLESS J), a character in Freemono but
>     ;; not in Liberation Mono.
>     (list (font-at 0 nil "a") (font-at 0 nil "ȷ")))
> 
> This changed the font for the non-ASCII character to Freemono
> and returned what I expected:
> 
>   (#<font-object "-1ASC-Liberation Mono-normal-normal-normal-*-15-*-*-*-m-0-iso10646-1">
>    #<font-object "-GNU -FreeMono-normal-normal-normal-*-40-*-*-*-m-0-iso10646-1">)
> 
> (Incidentally, evaluating the above progn without restarting Emacs
> causes a core dump, but I have a smaller test case for that and I'll
> make another report about it.)
> 
> It looks as if fontset-auto1 is generated by fontset_from_font
> in fontset.c, but I don't understand why the specified fontset
> (fontset-liberation) is not used and I haven't been able to find
> anything in the manual that clarifies this behavior.  I'd like
> to know how to use a custom fontset for a frame's default face
> (and for other faces), but if that's not supported, this may be
> a documentation bug.

CC'ing Handa-san in the hope that he could provide some insights.

Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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