GNU bug report logs - #73777
set-fontset-font doesn't set :size for specific characters when using some fonts

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Rodrigo Morales <rodrigo-mailing-lists <at> morales.pe>
Subject: bug#73777: closed (Re: bug#73777: set-fontset-font doesn't set
 :size for specific characters when using some fonts)
Date: Sat, 19 Oct 2024 16:20:03 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#73777: set-fontset-font doesn't set :size for specific characters when using some fonts

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 73777 <at> debbugs.gnu.org.

-- 
73777: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=73777
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: Rodrigo Morales <rodrigo-mailing-lists <at> morales.pe>
Cc: 73777-done <at> debbugs.gnu.org
Subject: Re: bug#73777: set-fontset-font doesn't set :size for specific
 characters when using some fonts
Date: Sat, 19 Oct 2024 19:19:05 +0300

> From: Rodrigo Morales <rodrigo-mailing-lists <at> morales.pe>
> CC: <73777 <at> debbugs.gnu.org>
> Date: Sat, 19 Oct 2024 11:17:22 -0500
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > So does this mean we can now close this bug?  Or are there any
> > left-overs we still need to handle?
> 
> We can close this bug.

Thanks, closing.

[Message part 3 (message/rfc822, inline)]

From: Rodrigo Morales <rodrigo-mailing-lists <at> morales.pe>
To: <bug-gnu-emacs <at> gnu.org>
Subject: set-fontset-font doesn't set :size for specific characters when
 using some fonts
Date: Sat, 12 Oct 2024 14:10:25 -0500

I am using GNU Emacs 29.4 in Ubuntu 22.04.5 LTS.

Today, I was trying to change the font size for the character =“= (#x201C, LEFT DOUBLE QUOTATION MARK) using the sexp shown below. I noticed an inconsistency: that sexp only sets the size for the character =“= when specific fonts are used.

#+BEGIN_SRC elisp
(set-fontset-font t ?“ (font-spec :family "Noto Sans Mono" :size 50))
#+END_SRC

In the section below, I describe minimal reproducible experiments. In the experiments, I use the file =/tmp/a.txt= containing the contents of the code block below:

#+HEADER: :tangle /tmp/a.txt
#+BEGIN_SRC text
a “ b
#+END_SRC

** Experiment 1 (:size for #x201C is not set): Set :size for #x201C

I started Emacs using the command shown below:

#+HEADER: :eval no
#+BEGIN_SRC sh
./src/emacs -Q /tmp/a.txt
#+END_SRC

The code block below shows the font reported for each character by calling =what-cursor-position= with a prefix argument. Screenshot: https://archive.is/9LxOH

#+BEGIN_SRC text
a: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-16-*-*-*-*-0-iso10646-1 (#x44)
“: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-16-*-*-*-*-0-iso10646-1 (#x209)
b: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-16-*-*-*-*-0-iso10646-1 (#x45)
#+END_SRC

Then, I evaluated the sexp shown below. Upon evaluating it, the size of the character “ (#x201C, LEFT DOUBLE QUOTATION MARK) didn't seem to increase. The second code block below shows the font reported for each character by calling =what-cursor-position= with a prefix argument. Screenshot: https://archive.ph/rVZSt

#+begin_src elisp
(set-fontset-font t ?“ (font-spec :family "Noto Sans Mono" :size 50))
#+end_src

#+BEGIN_SRC text
a: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-16-*-*-*-*-0-iso10646-1 (#x44)
“: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-16-*-*-*-*-0-iso10646-1 (#x209)
b: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-16-*-*-*-*-0-iso10646-1 (#x45)
#+END_SRC

** Experiment 2 (:size for #x201C is not set): Pass "Noto Sans Mono 10" to set-frame-font, then set :size for #x201C

I started Emacs using the command shown below:

#+HEADER: :eval no
#+BEGIN_SRC sh
./src/emacs -Q /tmp/a.txt
#+END_SRC

First, I evaluated the sexp shown in the first code block below. The second code block below shows the font reported for each character by calling =what-cursor-position= with a prefix argument. Screenshot: https://archive.ph/PVc8q

#+begin_src elisp
(set-frame-font "Noto Sans Mono 10" nil t)
#+end_src

#+BEGIN_SRC text
a: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-15-*-*-*-*-0-iso10646-1 (#x44)
“: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-15-*-*-*-*-0-iso10646-1 (#x209)
b: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-15-*-*-*-*-0-iso10646-1 (#x45)
#+END_SRC

Then, I evaluated the sexp shown below. Upon evaluating it, the size of the character “ (#x201C, LEFT DOUBLE QUOTATION MARK) didn't seem to increase. The second code block below shows the font reported for each character by calling =what-cursor-position= with a prefix argument. Screenshot: https://archive.is/AIuP0

#+begin_src elisp
(set-fontset-font t ?“ (font-spec :family "Noto Sans Mono" :size 50))
#+end_src

#+BEGIN_SRC text
a: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-15-*-*-*-*-0-iso10646-1 (#x44)
“: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-15-*-*-*-*-0-iso10646-1 (#x209)
b: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-15-*-*-*-*-0-iso10646-1 (#x45)
#+END_SRC

** Experiment 3 (:size for #x201C is set): Pass "Fixed 5" to set-frame-font, then set :family and :size for #x201C

I started Emacs using the command shown below:

#+HEADER: :eval no
#+BEGIN_SRC sh
./src/emacs -Q /tmp/a.txt
#+END_SRC

First, I evaluated the sexp shown in the first code block below. The second code block below shows the font reported for each character by calling =what-cursor-position= with a prefix argument. Screenshot: https://archive.is/v4Sr9

#+begin_src elisp
(set-frame-font "Fixed 5" nil t)
#+end_src

#+BEGIN_SRC text
a: ftcrhb:-Misc-Fixed-regular-normal-normal-*-7-*-*-*-c-50-iso10646-1 (#x62)
“: ftcrhb:-Misc-Fixed-medium-normal-normal-ja-13-*-*-*-c-120-iso10646-1 (#x3A3)
b: ftcrhb:-Misc-Fixed-regular-normal-normal-*-7-*-*-*-c-50-iso10646-1 (#x63)
#+END_SRC

Then, I evaluated the sexp shown below. Upon evaluating it, the size of the character “ (#x201C, LEFT DOUBLE QUOTATION MARK) significantly increased. The second code block below shows the font reported for each character by calling =what-cursor-position= with a prefix argument. Screenshot: https://archive.is/KYRGd

#+begin_src elisp
(set-fontset-font t ?“ (font-spec :family "Noto Sans Mono" :size 50))
#+end_src

#+BEGIN_SRC text
a: ftcrhb:-Misc-Fixed-regular-normal-normal-*-7-*-*-*-c-50-iso10646-1 (#x62)
“: ftcrhb:-GOOG-Noto Sans Mono-regular-normal-normal-*-50-*-*-*-*-0-iso10646-1 (#x209)
b: ftcrhb:-Misc-Fixed-regular-normal-normal-*-7-*-*-*-c-50-iso10646-1 (#x63)
#+END_SRC

** Conclusion

When the default font is not changed (see experiment 1) or is set using =(set-frame-font "Noto Sans Mono 10" nil t)= (see experiment 2), the sexp =(set-fontset-font t ?“ (font-spec :family "Noto Sans Mono" :size 50))= didn't seem to increase the size of the character “ (#x201C, LEFT DOUBLE QUOTATION MARK).

When the default font is set using =(set-frame-font "Fixed 5" nil t)= (see experiment 3), the sexp =(set-fontset-font t ?“ (font-spec :family "Noto Sans Mono" :size 50))= significantly increased the size of the character “ (#x201C, LEFT DOUBLE QUOTATION MARK).

To me, the expected behavior is that =(set-fontset-font t ?“ (font-spec :family "Noto Sans Mono" :size 50))= sets =:family= and =:size= for “ (#x201C, LEFT DOUBLE QUOTATION MARK) regardless of the font that is being used.

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