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From: Marco Wahl <marcowahlsoft@gmail.com>
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Subject: Re: =?utf-8?Q?=F0=9D=9C=96?= implies large line spacing
Date: Wed, 15 Mar 2017 08:25:19 +0100
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Florian Weimer <fw@deneb.enyo.de> 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 ITALIC EPSILON SYMBOL"
          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)
...