Re: How to enforce unicode font for all charsets?

[Sergey Organov <sorganov@gmail.com>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Sergey Organov <sorganov@gmail.com>
>> Cc: help-gnu-emacs@gnu.org
>> Date: Fri, 13 Mar 2020 14:58:04 +0300
>> 
>> > Thanks for the recipe.  Please go to each "привет" in the test buffer
>> > and type "C-u C-x =", then show what the *Help* buffer displays for
>> > each of the two.
>> 
>> Here are the results:
>> 
>> --- >8 ---
>>              position: 24 of 60 (38%), column: 23
>>             character: п (displayed as п) (codepoint 1087, #o2077, #x43f)
>>     preferred charset: windows-1251 (WINDOWS-1251 (Cyrillic))
>> code point in charset: 0xEF
>>                script: cyrillic
>>                syntax: w 	which means: word
>>              category: .:Base, L:Left-to-right (strong), Y:2-byte Cyrillic, c:Chinese, h:Korean, j:Japanese, y:Cyrillic
>>              to input: type "C-x 8 RET 43f" or "C-x 8 RET CYRILLIC SMALL LETTER PE"
>>           buffer code: #xD0 #xBF
>>             file code: #xD0 #xBF (encoded by coding system utf-8-unix)
>>               display: by this font (glyph code)
>>     x:-xos4-terminus-medium-r-normal--16-160-72-72-c-80-microsoft-cp1251 (#xEF)
>> 
>> Character code properties: customize what to show
>>   name: CYRILLIC SMALL LETTER PE
>>   general-category: Ll (Letter, Lowercase)
>>   decomposition: (1087) ('п')
>> 
>> There are text properties here:
>>   charset              windows-1251
>> --- >8 ---
>>              position: 54 of 60 (88%), column: 23
>>             character: п (displayed as п) (codepoint 1087, #o2077, #x43f)
>>     preferred charset: unicode (Unicode (ISO10646))
>> code point in charset: 0x043F
>>                script: cyrillic
>>                syntax: w 	which means: word
>>              category: .:Base, L:Left-to-right (strong), Y:2-byte Cyrillic, c:Chinese, h:Korean, j:Japanese, y:Cyrillic
>>              to input: type "C-x 8 RET 43f" or "C-x 8 RET CYRILLIC SMALL LETTER PE"
>>           buffer code: #xD0 #xBF
>>             file code: #xD0 #xBF (encoded by coding system utf-8-unix)
>>               display: by this font (glyph code)
>>     xft:-PfEd-DejaVu Sans Mono-normal-normal-normal-*-15-*-*-*-m-0-iso10646-1 (#x37E)
>
> So the windows-1251 charset is displayed by (a non-TrueType) font
> "Terminus", for some reason.  It's a bitmap font, so maybe just
> uninstalling it will fix your problem.  Or did it come with your
> system's installation OOTB?

I've installed terminus fonts and I do use them outside of Emacs, so
uninstalling would be a pain, especially as I already have a satisfying
work-around with tweaked fontset.

What I actually want to understand is why this font has been even
considered for use in the first place. Was it some library external to
Emacs that choose particular font? Doesn't seem to be the case, as
fontset tweaking "fixes" it, and it's entirely Emacs internal entity?

Thanks,
-- Sergey