From: Klaus-Dieter Bauer <bauer.klaus.dieter@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 24918@debbugs.gnu.org
Subject: bug#24918: 25.1; Fonts can make Emacs grind to a halt
Date: Tue, 29 Nov 2016 23:42:38 +0100 [thread overview]
Message-ID: <CANtbJLHU_ybWXJrb24piuZRFb+qssFzG5gC3AiDwxve60yemZw@mail.gmail.com> (raw)
In-Reply-To: <83inr6xjnv.fsf@gnu.org>
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2016-11-29 18:47 GMT+01:00 Eli Zaretskii <eliz@gnu.org>:
> > From: Klaus-Dieter Bauer <bauer.klaus.dieter@gmail.com>
> > Date: Tue, 29 Nov 2016 11:29:03 +0100
> > Cc: 24918@debbugs.gnu.org
> >
> > The issue occurs with the default fonts too ("emacs -Q"). On Windows
> that means `Courier New' for `default'
> > and `Monospace' for `fixed-pitch', `Monospace Serif` for
> `fixed-pitch-serif' and `Arial` for `variable-pitch'.
> >
> > With these default settings, the `package-list-packages' buffer works
> mostly fine, but the info page `(cl)
> > Structures' for instace does not. Using different fonts, e.g. `Linux
> Libertine Mono' or `Noto Mono', the issue
> > becomes only more widespread.
> >
> > I detail, I noticed that the issue indeed does occur specifically when
> font substitution kicks in. In the info-page
> > for `(cl) Structure' this occurs, because the "=>" is replaced by the
> unicode symbol "⇒", which is displayed in
> > a different font; Sadly I can't figure out a way to identify the
> substituted font; It is definitely a variable-pitch font
> > (the symbol is wider than the default font, such that characters are no
> longer vertically aligned with other
> > lines).
>
> That's very strange, because I see nothing similar on my systems.
>
> As Clément points out, "C-u C-x =" will show the font that is used to
> display those characters. Please tell what they are; they use Symbola
> here (and that's how things should be, by default).
>
Ah, I missed that line in `C-u C-x ='. (I also don't see any message from
Clément).
#### Using "emacs -Q" ####
It says for the ⇒ (\Rightarrow) symbol
display: by this font (glyph code)
uniscribe:-outline-Malgun
Gothic-normal-normal-normal-sans-17-*-*-*-p-*-ksc5601.1987-0 (#x22D)
For the ‖ (\Vert) and ※ (\textreferencemark) symbols:
uniscribe:-outline-MS
Gothic-normal-normal-normal-mono-17-*-*-*-c-*-gb2312.1980-0 (#x340)
For the symbol:
uniscribe:-outline-MS
Gothic-normal-normal-normal-mono-17-*-*-*-c-*-gb2312.1980-0 (#x364)
#### With init file ####
(using Linux Libertine Mono as default font)
The ‖ and ※ symbols work fine in that configuraiton.
"⇒" still causes the issue here too, and falls back to identically the same
`uniscribe' line
uniscribe:-outline-Malgun
Gothic-normal-normal-normal-sans-17-*-*-*-p-*-ksc5601.1987-0 (#x22D)
The extreme lag in `package-list-packages' seems to be caused by the ▲
symbol in the **header line**, which works fine with the default font, but
is substituted with
uniscribe:-outline-Malgun
Gothic-normal-normal-normal-sans-16-*-*-*-p-*-gb2312.1980-0 (#x240)
when using `Linux Libertine Mono' or `Noto Mono'.
By any chance, do any of your test systems run Windows and have MS Office
installed? (In my case the 2010 version.) It should be the primary source
of Unicode fonts on my system.
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next prev parent reply other threads:[~2016-11-29 22:42 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-10 15:53 bug#24918: 25.1; Fonts can make Emacs grind to a halt Klaus-Dieter Bauer
2016-11-10 16:20 ` Clément Pit--Claudel
2016-11-10 17:12 ` Eli Zaretskii
2016-11-10 22:05 ` Klaus-Dieter Bauer
2016-11-11 8:01 ` Eli Zaretskii
[not found] ` <CANtbJLGuWhD8jUQt_KEz82kpuknemNR8u2G71fqTav2bfrR-1Q@mail.gmail.com>
[not found] ` <83lgwc96nn.fsf@gnu.org>
[not found] ` <CANtbJLGpF-ME-rKFfTwpU28oJDcGr2ww2vJhPUx2zxqnreOXpQ@mail.gmail.com>
2016-11-28 15:47 ` Eli Zaretskii
2016-11-29 10:29 ` Klaus-Dieter Bauer
2016-11-29 14:09 ` Clément Pit--Claudel
2016-11-29 17:47 ` Eli Zaretskii
2016-11-29 22:42 ` Klaus-Dieter Bauer [this message]
2016-11-30 3:42 ` Eli Zaretskii
2016-11-30 10:01 ` Klaus-Dieter Bauer
2016-11-30 15:00 ` Eli Zaretskii
2016-12-01 10:21 ` Klaus-Dieter Bauer
2016-12-01 17:31 ` Eli Zaretskii
2016-11-29 23:17 ` Alan Third
2016-11-30 15:09 ` Eli Zaretskii
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