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Re: 𝜖 implies large line spacing

From: Florian Weimer
Subject: Re: 𝜖 implies large line spacing
Date: Sun, 19 Mar 2017 15:16:58 +0100

* Marco Wahl:

> Florian Weimer <> writes:
>> * Marco Wahl:
>>> Actually I'm not so happy with those large line spacings.
>>> I tried some fonts (e.g. Inconsolata and Courier) from Options."Set
>>> Default Font" but did not find any font keeping the line spacing small.
>> Have you checked with “C-u C-x =” that this actually affects the font
>> used for this glyph?  For me, setting the default font does not have
>> any effect on it.  I haven't yet figured out where Emacs finds the TeX
>> Gyre font.
> Thanks for the hint.  For me C-ux = yields :
>             character: 𝜖 (displayed as 𝜖) (codepoint 120598, #o353426, 
> #x1d716)
>     preferred charset: unicode (Unicode (ISO10646))
> code point in charset: 0x1D716
>                script: mathematical
>                syntax: w      which means: word
>              category: .:Base, L:Left-to-right (strong)
>              to input: type "C-x 8 RET 1d716" or "C-x 8 RET MATHEMATICAL 
>           buffer code: #xF0 #x9D #x9C #x96
>             file code: #xF0 #x9D #x9C #x96 (encoded by coding system 
> utf-8-unix)
>               display: by this font (glyph code)
>     xft:-PfEd-Latin Modern 
> Math-normal-normal-normal-*-15-*-*-*-*-0-iso10646-1 (#x112)
> ...

After an upgrade to Debian stretch, I now get this font instead:

      xft:-unknown-DejaVu Math TeX 
Gyre-normal-normal-normal-*-16-*-*-*-*-0-iso10646-1 (#x64A)

And the problem is gone.  The extended height for the original font
(TeX Gyre Termes Math) no longer shows up in LibreOffice Writer either
(where it did before).  So there has been a bug fix, likely not in
Emacs, but I don't know if it's the font metrics which have been
fixed, or some shared part of font rendering.

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