Re: Face issue -- possible bug

[Joost Kremers <joostkremers@fastmail.fm>]

On Tue, Jul 17 2018, Eli Zaretskii wrote:
>> From: Joost Kremers <joostkremers@fastmail.fm>
>> Date: Mon, 16 Jul 2018 22:49:18 +0200
>> 
>> So should this be reported as an Emacs bug, or should I contact 
>> the font creator?
>
> What does Emacs say if you go to the character and type "C-u C-x 
> =",
> when the problematic font is used?

Well d'uh, I could have thought of that myself... Anyway, with 
Linux Libertine O (which displays the character incorrectly), `C-u 
C-x =` gives:

==============================

             position: 182 of 268 (68%), column: 5
            character: n (displayed as n) (codepoint 110, #o156, 
            #x6e)
    preferred charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x6E
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), a:ASCII, 
             l:Latin, r:Roman
             to input: type "C-x 8 RET 6e" or "C-x 8 RET LATIN 
             SMALL LETTER N"
          buffer code: #x6E
            file code: #x6E (encoded by coding system utf-8-unix)
              display: composed to form "n̩" (see below)

Composed with the following character(s) "̩" using this font:
  xft:-PfEd-Linux Libertine 
  O-normal-normal-normal-*-21-*-*-*-*-0-iso10646-1
by these glyphs:
  [0 1 0 2420 13 0 13 10 1 nil]
  [0 1 809 745 0 -9 -6 -1 5 [-2 -1 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER N
  general-category: Ll (Letter, Lowercase)
  decomposition: (110) ('n')

There are text properties here:
  fontified            t
  wrap-prefix          ""

==============================

And with DejaVu Sans Mono (displaying the character correctly):

==============================


             position: 182 of 268 (68%), column: 5
            character: n (displayed as n) (codepoint 110, #o156, 
            #x6e)
    preferred charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x6E
               script: latin
               syntax: w 	which means: word
             category: .:Base, L:Left-to-right (strong), a:ASCII, 
             l:Latin, r:Roman
             to input: type "C-x 8 RET 6e" or "C-x 8 RET LATIN 
             SMALL LETTER N"
          buffer code: #x6E
            file code: #x6E (encoded by coding system utf-8-unix)
              display: composed to form "n̩" (see below)

Composed with the following character(s) "̩" using this font:
  xft:-PfEd-DejaVu Sans 
  Mono-normal-normal-normal-*-15-*-*-*-m-0-iso10646-1
by these glyphs:
  [0 1 110 81 9 1 8 8 5 nil]
  [0 1 809 689 0 4 6 -1 5 [-10 -1 0]]

Character code properties: customize what to show
  name: LATIN SMALL LETTER N
  general-category: Ll (Letter, Lowercase)
  decomposition: (110) ('n')

There are text properties here:
  fontified            t
  wrap-prefix          ""

==============================

The only difference I notice is with the numbers following "by 
these glyphs", but I have no idea what those numbers mean.

TIA

Joost



-- 
Joost Kremers
Life has its moments