GNU bug report logs - #25216
26.0.50 [regression]; Curly quotes are not found in some sizes of ‘Terminus’ font

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#25216: closed (26.0.50 [regression]; Curly quotes are not
 found in some sizes of ‘Terminus’ font)
Date: Mon, 25 Nov 2019 16:17:02 +0000

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Your message dated Mon, 25 Nov 2019 18:16:40 +0200
with message-id <83muckrkwn.fsf <at> gnu.org>
and subject line Re: bug#25216: 26.0.50 [regression]; Curly quotes are not found in some sizes of ‘Terminus’ font
has caused the debbugs.gnu.org bug report #25216,
regarding 26.0.50 [regression]; Curly quotes are not found in some sizes of ‘Terminus’ font
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Dmitry Alexandrov <321942 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50 [regression]; Curly quotes are not found in some sizes of
 ‘Terminus’ font
Date: Sat, 17 Dec 2016 04:03:07 +0300

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GNU Emacs 26.0.50.1 (x86_64-unknown-linux-gnu)
Repository revision: 6bf83218314db1c63ce34564edfb994d9431b28a
Debian GNU/Linux 8.6 Jessie
xfonts-terminus 4.40-2 as shipped in Debian

Steps to reproduce:

   $ emacs --quick --font '-*-terminus-medium-r-*-*-20-*-*-*-*-*-*-*'

Find some document with curly quotes: ‘’ and “”.  GNU Emacs Manual (‘<f1> r’) uses them heavily, for instance.

It looks wrong:

[91.png (image/png, inline)]

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‘C-u C-x =’ says that instead of Terminus ‘x:-misc-fixed-medium-r-normal--20-200-75-75-c-100-iso10646-1’ font is used for rendering quotes.  When I request 24th size, I got yet another font — ‘x:-efont-fixed-medium-r-normal--24-240-75-75-c-240-iso10646-1’.

In a strange way there is no such a problem with some other sizes:

   $ emacs --quick --font '-*-terminus-medium-r-*-*-16-*-*-*-*-*-*-*'

is okay, for example.  ‘C-u C-x =’ says that ‘xft:-xos4-Terminus-normal-normal-normal-*-16-*-*-*-c-80-iso10646-1’ is used in that case.

The reason is *not* that Terminus just does not have these glyphs — it does.  Moreover — GNU Emacs 24.4.1 finds and renders them correctly:

   $ emacs24 --quick --font '-*-terminus-medium-r-*-*-20-*-*-*-*-*-*-*'

[90.png (image/png, inline)]

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Dmitry Alexandrov <321942 <at> gmail.com>
Cc: larsi <at> gnus.org, 25216-done <at> debbugs.gnu.org
Subject: Re: bug#25216: 26.0.50 [regression]; Curly quotes are not found in
 some sizes of ‘Terminus’ font
Date: Mon, 25 Nov 2019 18:16:40 +0200

> From: Dmitry Alexandrov <321942 <at> gmail.com>
> Cc: larsi <at> gnus.org,  25216 <at> debbugs.gnu.org
> Date: Wed, 20 Nov 2019 18:01:48 +0300
> 
> Eli Zaretskii <eliz <at> gnu.org> wrote:
> >> > There was no response to this -- was any further progress made?
> >> 
> >> On my side: sorry, no.  I am fine with the workaround:
> >> 
> >> 	Emacs.fontBackend: xft
> >> 
> >> (in ~/.Xresources).
> >
> > Could you try the master branch, after making sure you have HarfBuzz installed?  The xft font backend is going to be much less important starting with Emacs 27, so I'd like to know whether this problerm exists with HarfBuzz
> 
> Yes, the problem is still here, symptoms are the same, except that Terminus is now loaded via harfbuzz:
> 
> 	xfthb:-xos4-Terminus-normal-normal-normal-*-18-*-*-*-c-100-iso10646-1
> 	   ^^
> 
> The same workaround works as well:
> 
> 	Emacs.fontBackend: xfthb

I've built the latest version 4.48 of the Terminus font on MS-Windows
and tried it with Emacs 27.  I couldn't reproduce the problem reported
with the xft or xfthb font backends: no matter what size of the font I
tried, the curly quote characters came from the same font.  I do see
that, since this font is bitmapped, i.e. not TrueType, Emacs on
Windows uses the GDI font backend to display it, not the default
HarfBuzz backend.

So I think what you see is something specific to the libxft2 library.
And since this discussion identified at least 2 workarounds: either
customize the fontset, or force the single xft backend in .Xresources,
I think this bug can be closed now.

Thanks.

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