Re: 𝜖 implies large line spacing

[Alexis <flexibeast@gmail.com>]

Florian Weimer <fw@deneb.enyo.de> writes:

> * Marco Wahl:
>
>> 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)
>> ...
>
> 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.

Well, there were certainly issues with the font metrics of Latin Modern
Math, such that Firefox showed line height issues also:

https://bugzilla.mozilla.org/show_bug.cgi?id=1208776

(Cf. https://bugzilla.mozilla.org/show_bug.cgi?id=1170782 for
background.)


Alexis.