GNU bug report logs - #73752
29.4; Ligatures are randomly rendered with extra spaces

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From: Yixuan Chen <xuan <at> xlk.me>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: luangruo <at> yahoo.com, 73752 <at> debbugs.gnu.org, visuweshm <at> gmail.com
Subject: bug#73752: 29.4; Ligatures are randomly rendered with extra spaces
Date: Mon, 28 Oct 2024 13:28:14 -0400

On 10/28/24 13:19, Eli Zaretskii wrote:
>> Date: Mon, 28 Oct 2024 11:20:29 -0400
>> Cc: visuweshm <at> gmail.com, luangruo <at> yahoo.com, 73752 <at> debbugs.gnu.org
>> From: Yixuan Chen <xuan <at> xlk.me>
>>
>>> Actually, how about showing what "C-u C-x =" says in each of the 6
>>> positions you show?  And then show what "C-u C-x =" says in the same 6
>>> positions in the "good" display?
>>
>> See "bad.txt" for the output of the bad emacs display, and "good.txt"
>> for the output of good emacs display. I also attached the block cursor
>> screenshots for good emacs display.
> 
> Thanks.  It's basically the same, as far as Emacs thinks, but do you
> have any idea why EOB is different between these two cases (3535 vs
> 3527)?

Between the two versions (after bad.txt before good.txt), I made this 
change to the script: line 51 is modified from

    (run-at-time nil 1 #'random-faces)))
to
    ;; (run-at-time nil 1 #'random-faces)
    ))

so that I can manually set the face to face12. That's why EOB of 
"good.txt" is slightly larger.

> Also, Emacs thinks that the second | character is at the same buffer
> position and the same columns as the previous one -- any idea why?

I'm sorry, that's me being bad at mouse and copy-pasting. This is the 
correct output for the second | character in "bad.txt".

             position: 1275 of 3527 (36%), column: 32
            character: | (displayed as |) (codepoint 124, #o174, #x7c)
              charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x7C
               script: latin
               syntax: _ 	which means: symbol
             category: .:Base, a:ASCII, l:Latin, r:Roman
             to input: type "C-x 8 RET 7c" or "C-x 8 RET VERTICAL LINE"
          buffer code: #x7C
            file code: #x7C (encoded by coding system utf-8-unix)
              display: by this font (glyph code):
    ftcrhb:-SAJA-Cascadia 
Code-light-normal-normal-*-17-*-*-*-m-0-iso10646-1 (#x9F6)

Character code properties: customize what to show
  name: VERTICAL LINE
  old-name: VERTICAL BAR
  general-category: Sm (Symbol, Math)
  decomposition: (124) ('|')

There are text properties here:
  face                 (face12 font-lock-string-face)
  fontified            t

It seems like I simply pasted the output for the first bar character twice.

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