GNU bug report logs - #59122
29.0.50; global-text-scale-adjust not working on macOS

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Rudolf Adamkovič <salutis <at> me.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; global-text-scale-adjust not working
Date: Tue, 08 Nov 2022 13:28:46 +0100

Reproduction:

  1. emacs -Q
  2. type M-x global-text-scale-adjust RET
  4. type -

Expected:

  font size decreases

Actual:

  nothing happens

Notes:

  text-scale-adjust, which does not share code with
  global-text-scale-adjust, works correctly.

Rudy


In GNU Emacs 29.0.50 (build 6, aarch64-apple-darwin21.6.0, NS
 appkit-2113.60 Version 12.6 (Build 21G115)) of 2022-11-08 built on
 Rudolfs-MacBook-Air.local
Repository revision: 80c3fadfd57ee797404c80b8e88371c53edecfe5
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.6

Configured using:
 'configure --with-native-compilation=aot --with-json'

Configured features:
ACL DBUS GLIB GNUTLS JSON LCMS2 LIBXML2 MODULES NATIVE_COMP NOTIFY
KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TOOLKIT_SCROLL_BARS WEBP XIM
ZLIB

Important settings:
  value of $LC_ALL: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: ELisp/l

Minor modes in effect:
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  paredit-mode: t
  flyspell-mode: t
  global-hl-todo-mode: t
  hl-todo-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  shell-dirtrack-mode: t
  sly-symbol-completion-mode: t
  whitespace-mode: t
  display-fill-column-indicator-mode: t
  display-line-numbers-mode: t
  savehist-mode: t
  delete-selection-mode: t
  global-goto-address-mode: t
  goto-address-mode: t
  global-subword-mode: t
  subword-mode: t
  save-place-mode: t
  bug-reference-prog-mode: t
  global-auto-revert-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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Features:
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org-fold-core org-keys oc org-loaddefs find-func cal-menu calendar
cal-loaddefs org-version org-compat org-macs format-spec
flyspell-correct-autoloads eglot-autoloads markdown-mode-autoloads
org-drill-autoloads bbdb-autoloads vterm-autoloads swift-mode-autoloads
htmlize-autoloads emms-autoloads yaml-mode-autoloads citar-autoloads
citeproc-autoloads f-autoloads bnf-mode-autoloads kotlin-mode-autoloads
magit-autoloads persist-autoloads embark-autoloads ebnf-mode-autoloads
queue-autoloads cape-autoloads rainbow-mode-autoloads
flymake-grammarly-autoloads grammarly-autoloads websocket-autoloads
git-commit-autoloads modus-themes-autoloads paredit-autoloads
telega-autoloads rainbow-identifiers-autoloads password-store-autoloads
with-editor-autoloads s-autoloads orderless-autoloads
string-inflection-autoloads sly-autoloads diff-hl-autoloads
parsebib-autoloads magit-section-autoloads dash-autoloads
visual-fill-column-autoloads yasnippet-autoloads hl-todo-autoloads
graphviz-dot-mode-autoloads org-pomodoro-autoloads pdf-tools-autoloads
tablist-autoloads mentor-autoloads url-scgi-autoloads async-autoloads
xml-rpc-autoloads alert-autoloads log4e-autoloads gntp-autoloads
elfeed-tube-mpv-autoloads mpv-autoloads sql-indent-autoloads
sqlup-mode-autoloads auctex-autoloads tex-site elfeed-tube-autoloads
aio-autoloads elfeed-autoloads request-autoloads geiser-guile-autoloads
geiser-impl help-fns radix-tree help-mode geiser-custom geiser-base ring
geiser-autoloads transient-autoloads compat-autoloads info ess-autoloads
package browse-url url url-proxy url-privacy url-expand url-methods
url-history url-cookie generate-lisp-file url-domsuf url-util mailcap
url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs
password-cache json subr-x map byte-opt gv bytecomp byte-compile
url-vars cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc paren
electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
term/ns-win ns-win ucs-normalize mule-util term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow
isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax
font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic
indonesian philippine cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
composite emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind kqueue cocoa ns
lcms2 multi-tty make-network-process native-compile emacs)

Memory information:
((conses 16 892803 84886)
 (symbols 48 44223 26)
 (strings 32 156059 7869)
 (string-bytes 1 5552735)
 (vectors 16 73982)
 (vector-slots 8 1958557 93521)
 (floats 8 558 119)
 (intervals 56 5794 448)
 (buffers 984 18))

-- 
"'Contrariwise,' continued Tweedledee, 'if it was so, it might be; and
if it were so, it would be; but as it isn't, it ain't.  That's logic.'"
-- Lewis Carroll, Through the Looking Glass, 1871/1872

Rudolf Adamkovič <salutis <at> me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

Message #8 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Rudolf Adamkovič <salutis <at> me.com>
Cc: 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Tue, 08 Nov 2022 14:42:39 +0200

> Date: Tue, 08 Nov 2022 13:28:46 +0100
> From:  Rudolf Adamkovič via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
>   1. emacs -Q
>   2. type M-x global-text-scale-adjust RET
>   4. type -
> 
> Expected:
> 
>   font size decreases
> 
> Actual:
> 
>   nothing happens

I cannot reproduce this, it works as expected for me.  But I'm not on
macOS.

Message #11 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Rudolf Adamkovič <salutis <at> me.com>
Cc: 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Tue, 08 Nov 2022 12:47:10 +0000

>
> Reproduction:
>
> 1. emacs -Q
> 2. type M-x global-text-scale-adjust RET
> 4. type -
>

Is there a 3. missing in your recipe?

>
> Expected:
>
> font size decreases
>
> Actual:
>
> nothing happens
>

Really nothing?  Do you see something in the echo area?  What happens if 
you press + instead?  Also, can you try again after M-x 
toggle-debug-on-error RET?

Message #14 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Rudolf Adamkovič <salutis <at> me.com>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Tue, 08 Nov 2022 22:48:53 +0100

Gregory Heytings <gregory <at> heytings.org> writes:

> Is there a 3. missing in your recipe?

No.

> Really nothing?

Really.

> Do you see something in the echo area?

"Use +, =, -, 0, ESC for further adjustment"

> What happens if you press + instead?

`+' works.

(Also, for some reason, `global-text-scale-adjust' increases the font
size once when executed, without me typing `+'.  Should that happen?)

> Also, can you try again after M-x toggle-debug-on-error RET?

No errors.

Rudy
-- 
"Be especially critical of any statement following the word
'obviously.'"
-- Anna Pell Wheeler, 1883-1966

Rudolf Adamkovič <salutis <at> me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

Message #17 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Rudolf Adamkovič <salutis <at> me.com>
Cc: gregory <at> heytings.org, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 05:33:03 +0200

> Cc: 59122 <at> debbugs.gnu.org
> Date: Tue, 08 Nov 2022 22:48:53 +0100
> From:  Rudolf =?UTF-8?Q?Adamkovi=C4=8D?= via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> > What happens if you press + instead?
> 
> `+' works.

What does "C-h l" show after you press '-' and after you press '+'?

Message #20 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Rudolf Adamkovič <salutis <at> me.com>
Cc: 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 10:00:34 +0000

>> What happens if you press + instead?
>
> `+' works.
>

Okay, and after you press '+', does '-' work?  Also, as Eli asked, can you 
type C-h l after pressing '+' and '-' a few times?  You should see 
something like this:

+    ;; global-text-scale-adjust
+    ;; global-text-scale-adjust
-    ;; global-text-scale-adjust
-    ;; global-text-scale-adjust

>
> (Also, for some reason, `global-text-scale-adjust' increases the font 
> size once when executed, without me typing `+'.  Should that happen?)
>

Yes.

Message #23 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: 59122 <at> debbugs.gnu.org, Rudolf Adamkovič <salutis <at> me.com>
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 9 Nov 2022 14:28:54 +0100

Gregory Heytings <gregory <at> heytings.org> writes:

> >> What happens if you press + instead?
> >
> > `+' works.
> >
>
> Okay, and after you press '+', does '-' work?  Also, as Eli asked, can you
> type C-h l after pressing '+' and '-' a few times?  You should see
> something like this:

I can reproduce this bug on macOS 12.6.1 (OP is on 12.6).

After pressing '+', '-' still doesn't decrease the font size.  I can
only increase it using '+'.

Output of C-h l:

 M-x      ;; execute-extended-command
 g      ;; self-insert-command
 l      ;; self-insert-command
 o      ;; self-insert-command
 b      ;; self-insert-command
 a      ;; self-insert-command
 l      ;; self-insert-command
 <tab>      ;; minibuffer-complete
 t      ;; self-insert-command
 e      ;; self-insert-command
 x      ;; self-insert-command
 t      ;; self-insert-command
 <tab>      ;; minibuffer-complete
 <return> ;; minibuffer-complete-and-exit
 -      ;; global-text-scale-adjust
 -      ;; global-text-scale-adjust
 +      ;; global-text-scale-adjust
 -      ;; global-text-scale-adjust
 +      ;; global-text-scale-adjust
 -      ;; global-text-scale-adjust
 -      ;; global-text-scale-adjust
 -      ;; global-text-scale-adjust
 C-h l      ;; view-lossage

Message #26 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: Rudolf Adamkovič <salutis <at> me.com>, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 13:39:20 +0000

>
> I can reproduce this bug on macOS 12.6.1 (OP is on 12.6).
>
> After pressing '+', '-' still doesn't decrease the font size.  I can 
> only increase it using '+'.
>
> Output of C-h l:
>

Thanks.  What do you get when you eval

(face-attribute 'default :height)

?  And what happens when you eval

(set-face-attribute 'default nil :height (- (face-attribute 'default :height) 5))

?  If nothing happens, can you try with 6, 7, 8... instead of 5, until 
something happens?

Message #29 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: salutis <at> me.com, gregory <at> heytings.org, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 15:40:57 +0200

> Cc: 59122 <at> debbugs.gnu.org, Rudolf Adamkovič <salutis <at> me.com>
> From: Stefan Kangas <stefankangas <at> gmail.com>
> Date: Wed, 9 Nov 2022 14:28:54 +0100
> 
> I can reproduce this bug on macOS 12.6.1 (OP is on 12.6).
> 
> After pressing '+', '-' still doesn't decrease the font size.  I can
> only increase it using '+'.

Please step with Edebug into global-text-scale-adjust, and tell what
do you see in the variable 'key' in the following fragment from the
command:

    (let* ((key (event-basic-type last-command-event))
           (echo-keystrokes nil)
           (cur (face-attribute 'default :height))
           (inc
            (pcase key
              (?- (* (- increment) 5))
              (?0 (- global-text-scale-adjust--default-height cur))
              (_ (* increment 5))))

Message #32 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: Rudolf Adamkovič <salutis <at> me.com>, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 9 Nov 2022 15:30:15 +0100

Gregory Heytings <gregory <at> heytings.org> writes:

> What do you get when you eval
>
> (face-attribute 'default :height)

(face-attribute 'default :height) => 150

> ?  And what happens when you eval
>
> (set-face-attribute 'default nil :height (- (face-attribute 'default :height) 5))

Nothing happens.

> ?  If nothing happens, can you try with 6, 7, 8... instead of 5, until
> something happens?

With

(set-face-attribute 'default nil :height (- (face-attribute 'default
:height) 6))

the font size is decreased.  If I evaluate it more than once, the font
size decreases more with each additional invocation.

Message #35 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: salutis <at> me.com, gregory <at> heytings.org, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 9 Nov 2022 15:35:31 +0100

Eli Zaretskii <eliz <at> gnu.org> writes:

> Please step with Edebug into global-text-scale-adjust, and tell what
> do you see in the variable 'key' in the following fragment from the
> command:
>
>     (let* ((key (event-basic-type last-command-event))

On the first invocation of 'global-text-scale-adjust':

last-command-event: 13 (#o15, #xd, ?\C-m)
key: 109 (#o155, #x6d, ?m)

When I then type '-', I see:

last-command-event: 45 (#o55, #x2d, ?-)
key: 45 (#o55, #x2d, ?-)

>            (echo-keystrokes nil)
>            (cur (face-attribute 'default :height))
>            (inc
>             (pcase key
>               (?- (* (- increment) 5))
>               (?0 (- global-text-scale-adjust--default-height cur))
>               (_ (* increment 5))))

Message #38 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 59122 <at> debbugs.gnu.org, Gregory Heytings <gregory <at> heytings.org>,
 Rudolf Adamkovič <salutis <at> me.com>
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 15:36:25 +0100

>>>>> On Wed, 9 Nov 2022 15:30:15 +0100, Stefan Kangas <stefankangas <at> gmail.com> said:
    Stefan> With

    Stefan> (set-face-attribute 'default nil :height (- (face-attribute 'default
    Stefan> :height) 6))

    Stefan> the font size is decreased.  If I evaluate it more than once, the font
    Stefan> size decreases more with each additional invocation.

But it actually decreases by 10, right? (and similarly for increases)

Robert
-- 

Message #41 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: Rudolf Adamkovič <salutis <at> me.com>, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 14:36:47 +0000

>
> (set-face-attribute 'default nil :height (- (face-attribute 'default :height) 6))
>
> the font size is decreased.  If I evaluate it more than once, the font 
> size decreases more with each additional invocation.
>

Thanks.  The safe fix should be to change 5 to 6 here.  Eli, do you agree, 
or is there something else to investigate?

Message #44 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: 59122 <at> debbugs.gnu.org, Gregory Heytings <gregory <at> heytings.org>,
 Rudolf Adamkovič <salutis <at> me.com>
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 9 Nov 2022 15:43:05 +0100

Robert Pluim <rpluim <at> gmail.com> writes:

> >>>>> On Wed, 9 Nov 2022 15:30:15 +0100, Stefan Kangas <stefankangas <at> gmail.com> said:
>     Stefan> With
>
>     Stefan> (set-face-attribute 'default nil :height (- (face-attribute 'default
>     Stefan> :height) 6))
>
>     Stefan> the font size is decreased.  If I evaluate it more than once, the font
>     Stefan> size decreases more with each additional invocation.
>
> But it actually decreases by 10, right? (and similarly for increases)

It would seem so:

(cons (face-attribute 'default :height)
      (progn
    (set-face-attribute 'default nil
                :height (- (face-attribute 'default :height) 6))
    (face-attribute 'default :height)))
=> (120 . 110)

With 'global-text-scale-adjust', in a fresh emacs -Q, I see that:

(cons (face-attribute 'default :height)
      (progn
    (global-text-scale-adjust 1)
    (face-attribute 'default :height)))
=> (120 . 130)

Message #47 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: Rudolf Adamkovič <salutis <at> me.com>, 59122 <at> debbugs.gnu.org,
 Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 14:47:34 +0000

>> With
>>
>> (set-face-attribute 'default nil :height (- (face-attribute 'default :height) 6))
>>
>> the font size is decreased.  If I evaluate it more than once, the font 
>> size decreases more with each additional invocation.
>
> But it actually decreases by 10, right? (and similarly for increases)
>

That might be what it does on macOS, but it's not what it does on 
GNU/Linux.  With my configuration the successive values are 109, 105, 102, 
98, 94, 90, 87, 83, ... or with 6 instead of 5: 109, 102, 98, 90, 83, ...

So it seems that after all simply remplacing 5 by 6 isn't optimal.

Is this bug specific to the most recent version of macOS?

Message #50 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 59122 <at> debbugs.gnu.org, Gregory Heytings <gregory <at> heytings.org>,
 Rudolf Adamkovič <salutis <at> me.com>
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 15:48:01 +0100

>>>>> On Wed, 9 Nov 2022 15:43:05 +0100, Stefan Kangas <stefankangas <at> gmail.com> said:
    >> But it actually decreases by 10, right? (and similarly for increases)

    Stefan> It would seem so:

    Stefan> (cons (face-attribute 'default :height)
    Stefan>       (progn
    Stefan>     (set-face-attribute 'default nil
    Stefan>                 :height (- (face-attribute 'default :height) 6))
    Stefan>     (face-attribute 'default :height)))
    Stefan> => (120 . 110)

    Stefan> With 'global-text-scale-adjust', in a fresh emacs -Q, I see that:

    Stefan> (cons (face-attribute 'default :height)
    Stefan>       (progn
    Stefan>     (global-text-scale-adjust 1)
    Stefan>     (face-attribute 'default :height)))
    Stefan> => (120 . 130)

And on my X build it goes

181 -> 173 -> 166

and

181 -> 188 -> 196

(using 5 or 6 as the adjustment makes no difference to the sequence on
X for me)

Robert
-- 

Message #53 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: 59122 <at> debbugs.gnu.org, salutis <at> me.com, stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 16:51:26 +0200

> Cc: Rudolf Adamkovič <salutis <at> me.com>, 59122 <at> debbugs.gnu.org
> Date: Wed, 09 Nov 2022 14:36:47 +0000
> From: Gregory Heytings <gregory <at> heytings.org>
> 
> > (set-face-attribute 'default nil :height (- (face-attribute 'default :height) 6))
> >
> > the font size is decreased.  If I evaluate it more than once, the font 
> > size decreases more with each additional invocation.
> >
> 
> Thanks.  The safe fix should be to change 5 to 6 here.  Eli, do you agree, 
> or is there something else to investigate?

Can you tell more?  I don't think I understand why decreasing the face
height by 5 doesn't work, but decreasing it by 6 does.  If you do
understand, please tell.

Message #56 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: gregory <at> heytings.org
Cc: salutis <at> me.com, 59122 <at> debbugs.gnu.org, stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 16:59:04 +0200

> Cc: 59122 <at> debbugs.gnu.org, salutis <at> me.com, stefankangas <at> gmail.com
> Date: Wed, 09 Nov 2022 16:51:26 +0200
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> > Thanks.  The safe fix should be to change 5 to 6 here.  Eli, do you agree, 
> > or is there something else to investigate?
> 
> Can you tell more?  I don't think I understand why decreasing the face
> height by 5 doesn't work, but decreasing it by 6 does.  If you do
> understand, please tell.

Also, how come text-scale-adjust does work on the same platform?

Message #59 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: Rudolf Adamkovič <salutis <at> me.com>,
 Robert Pluim <rpluim <at> gmail.com>, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 9 Nov 2022 15:59:30 +0100

Gregory Heytings <gregory <at> heytings.org> writes:

> Is this bug specific to the most recent version of macOS?

I unfortunately only have access to the most recent version (12.6.1)
for testing.

(BTW, macOS 12.6 is dog-slow on older hardware, and AFAICT has no
useful new features - not one.  But Apple is no longer releasing
security fixes for older versions, so you are effectively forced to
upgrade if you care about security.)

Message #62 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: Rudolf Adamkovič <salutis <at> me.com>,
 Gregory Heytings <gregory <at> heytings.org>, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 16:20:14 +0100

>>>>> On Wed, 9 Nov 2022 15:59:30 +0100, Stefan Kangas <stefankangas <at> gmail.com> said:

    Stefan> Gregory Heytings <gregory <at> heytings.org> writes:
    >> Is this bug specific to the most recent version of macOS?

    Stefan> I unfortunately only have access to the most recent version (12.6.1)
    Stefan> for testing.

12.6 behaves the same

    Stefan> (BTW, macOS 12.6 is dog-slow on older hardware, and AFAICT has no
    Stefan> useful new features - not one.  But Apple is no longer releasing
    Stefan> security fixes for older versions, so you are effectively forced to
    Stefan> upgrade if you care about security.)

Every time I upgrade I sit through the "this is what we changed"
slideshow, and none of it ever matters to me.

Robert
-- 

Message #65 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 59122 <at> debbugs.gnu.org, gregory <at> heytings.org, salutis <at> me.com,
 stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 16:25:14 +0100

>>>>> On Wed, 09 Nov 2022 16:59:04 +0200, Eli Zaretskii <eliz <at> gnu.org> said:

    >> Cc: 59122 <at> debbugs.gnu.org, salutis <at> me.com, stefankangas <at> gmail.com
    >> Date: Wed, 09 Nov 2022 16:51:26 +0200
    >> From: Eli Zaretskii <eliz <at> gnu.org>
    >> 
    >> > Thanks.  The safe fix should be to change 5 to 6 here.  Eli, do you agree, 
    >> > or is there something else to investigate?
    >> 
    >> Can you tell more?  I don't think I understand why decreasing the face
    >> height by 5 doesn't work, but decreasing it by 6 does.  If you do
    >> understand, please tell.

    Eli> Also, how come text-scale-adjust does work on the same platform?

As far as I can tell from its somewhat convoluted code and docstrings,
that scales up and down by 20% every time.

Robert
-- 

Message #68 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: salutis <at> me.com, 59122 <at> debbugs.gnu.org, stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 16:01:04 +0000

>
> Can you tell more?  I don't think I understand why decreasing the face 
> height by 5 doesn't work, but decreasing it by 6 does.  If you do 
> understand, please tell.
>

It's because of rounding.  Face heights on macOS are multiples of 10 (100 
for 10.0 pt, 110 for 11.0 pt, ...).  Setting the face height to 105 
actually sets it to 110.

So I think what we should do here is to check, after set-face-attribute, 
whether the face height has actually changed, and if not try again with a 
bigger increment.

Message #71 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: salutis <at> me.com, 59122 <at> debbugs.gnu.org, stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 16:02:44 +0000

>
> Also, how come text-scale-adjust does work on the same platform?
>

Because text-scale-adjust is cruder: it uses a factor instead of an 
increment.  The effect of global-text-scale-adjust is much smoother.

Message #74 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: Rudolf Adamkovič <salutis <at> me.com>, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 16:18:32 +0000

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

Stefan, Rudolf, can you try the attached patch and see if it fixes the 
issue?

Thanks.

[Fix-global-face-scaling-bug-due-to-rounding.patch (text/x-diff, attachment)]

Message #77 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: salutis <at> me.com, 59122 <at> debbugs.gnu.org, stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 18:53:19 +0200

> Date: Wed, 09 Nov 2022 16:01:04 +0000
> From: Gregory Heytings <gregory <at> heytings.org>
> cc: 59122 <at> debbugs.gnu.org, salutis <at> me.com, stefankangas <at> gmail.com
> 
> It's because of rounding.  Face heights on macOS are multiples of 10 (100 
> for 10.0 pt, 110 for 11.0 pt, ...).  Setting the face height to 105 
> actually sets it to 110.
> 
> So I think what we should do here is to check, after set-face-attribute, 
> whether the face height has actually changed, and if not try again with a 
> bigger increment.

Yes, SGTM.

Message #80 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: salutis <at> me.com, 59122 <at> debbugs.gnu.org, stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Wed, 09 Nov 2022 18:55:27 +0200

> Date: Wed, 09 Nov 2022 16:02:44 +0000
> From: Gregory Heytings <gregory <at> heytings.org>
> cc: 59122 <at> debbugs.gnu.org, salutis <at> me.com, stefankangas <at> gmail.com
> 
> > Also, how come text-scale-adjust does work on the same platform?
> >
> 
> Because text-scale-adjust is cruder: it uses a factor instead of an 
> increment.  The effect of global-text-scale-adjust is much smoother.

This subtle difference should probably be in the doc string, as users
will normally assume that global-text-scale-adjust is just a
globalized version of text-scale-adjust.

Message #83 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Rudolf Adamkovič <salutis <at> me.com>
To: Gregory Heytings <gregory <at> heytings.org>, Stefan Kangas
 <stefankangas <at> gmail.com>
Cc: 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Thu, 10 Nov 2022 01:26:44 +0100

Gregory Heytings <gregory <at> heytings.org> writes:

> Stefan, Rudolf, can you try the attached patch and see if it fixes the
> issue?

I apologize for replying late.

So, I tried the patch (applied on top of 04ade0508d) and it does not fix
the problem.  After `M-x global-text-scale-adjust RET', the command
immediately makes the font larger (without me ever pressing `+'), and
`-' still does nothing.

Rudy
-- 
"Genius is 1% inspiration and 99% perspiration."
-- Thomas Alva Edison, 1932

Rudolf Adamkovič <salutis <at> me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

Message #86 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: salutis <at> me.com, Gregory Heytings <gregory <at> heytings.org>,
 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Thu, 10 Nov 2022 01:44:18 +0100

Eli Zaretskii <eliz <at> gnu.org> writes:

> > Because text-scale-adjust is cruder: it uses a factor instead of an
> > increment.  The effect of global-text-scale-adjust is much smoother.
>
> This subtle difference should probably be in the doc string, as users
> will normally assume that global-text-scale-adjust is just a
> globalized version of text-scale-adjust.

Is 'global-text-scale-adjust' new in Emacs 29?  Maybe it would be
better if they both work the same, presumably the same way as
'text-scale-adjust' does now (or the other way, if that's better).
Then we could introduce a new defcustom to make them both behave the
other way.  Would that make sense?

Message #89 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: salutis <at> me.com, gregory <at> heytings.org, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Thu, 10 Nov 2022 09:56:01 +0200

> From: Stefan Kangas <stefankangas <at> gmail.com>
> Date: Thu, 10 Nov 2022 01:44:18 +0100
> Cc: Gregory Heytings <gregory <at> heytings.org>, 59122 <at> debbugs.gnu.org, salutis <at> me.com
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > > Because text-scale-adjust is cruder: it uses a factor instead of an
> > > increment.  The effect of global-text-scale-adjust is much smoother.
> >
> > This subtle difference should probably be in the doc string, as users
> > will normally assume that global-text-scale-adjust is just a
> > globalized version of text-scale-adjust.
> 
> Is 'global-text-scale-adjust' new in Emacs 29?  Maybe it would be
> better if they both work the same, presumably the same way as
> 'text-scale-adjust' does now (or the other way, if that's better).
> Then we could introduce a new defcustom to make them both behave the
> other way.  Would that make sense?

Gregory says the different operation of the global mode is a feature,
so making them behave the same would either mean losing the feature or
an incompatible change to text-scale-adjust.

Message #92 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Rudolf Adamkovič <salutis <at> me.com>
Cc: 59122 <at> debbugs.gnu.org, Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Thu, 10 Nov 2022 08:33:23 +0000

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

>
> So, I tried the patch (applied on top of 04ade0508d) and it does not fix 
> the problem.  After `M-x global-text-scale-adjust RET', the command 
> immediately makes the font larger (without me ever pressing `+'), and 
> `-' still does nothing.
>

Thanks.  Can you try the attached patch instead, and post what you see in 
*Messages*?

[debug.patch (text/x-diff, attachment)]

Message #95 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: 59122 <at> debbugs.gnu.org, Rudolf Adamkovič <salutis <at> me.com>
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Thu, 10 Nov 2022 17:16:46 +0100

Gregory Heytings <gregory <at> heytings.org> writes:

> Thanks.  Can you try the attached patch instead, and post what you see in
> *Messages*?

Here's the result of 'M-x global-text-scale-adjust RET' and then
typing '-' repeatedly (in emacs -Q):

For information about GNU Emacs and the GNU system, type C-h C-a.
global-text-scale-adjust 120 -> 125
Use +, =, -, 0, ESC for further adjustment
global-text-scale-adjust 130 -> 125
Use +, =, -, 0, ESC for further adjustment
global-text-scale-adjust 130 -> 125
Use +, =, -, 0, ESC for further adjustment
global-text-scale-adjust 130 -> 125
Use +, =, -, 0, ESC for further adjustment
You can run the command ‘global-text-scale-adjust’ with C-x C-M-0
Use +, =, -, 0, ESC for further adjustment
global-text-scale-adjust 130 -> 125

Message #98 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: Rudolf Adamkovič <salutis <at> me.com>, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Thu, 10 Nov 2022 17:00:50 +0000

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

>
> Here's the result of 'M-x global-text-scale-adjust RET' and then typing 
> '-' repeatedly (in emacs -Q):
>

Thanks.  A call to redisplay was missing in the previous patch; the 
attached one should work.

[Fix-global-face-scaling-bug-due-to-rounding.patch (text/x-diff, attachment)]

Message #101 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: Rudolf Adamkovič <salutis <at> me.com>, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Fri, 11 Nov 2022 17:05:04 +0100

Gregory Heytings <gregory <at> heytings.org> writes:

> Thanks.  A call to redisplay was missing in the previous patch; the
> attached one should work.

Thanks, I can confirm that this patch works.

Message #106 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Rudolf Adamkovič <salutis <at> me.com>
To: Stefan Kangas <stefankangas <at> gmail.com>, Gregory Heytings
 <gregory <at> heytings.org>
Cc: 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 01:23:58 +0100

Stefan Kangas <stefankangas <at> gmail.com> writes:

> Thanks, I can confirm that this patch works.

Works here too, but the function still increases the font size right
after I execute it.

In other words, to have *no change* in font size, I have do:

1. type `M-x' and `global-text-scale-adjust' and `RET'
2. type `-'
3. type `q'

`text-scale-adjust' does this too, so I guess ... a feature?

Also, the two function now scale super-duper differently. :-/

Rudy
-- 
"Genius is 1% inspiration and 99% perspiration."
-- Thomas Alva Edison, 1932

Rudolf Adamkovič <salutis <at> me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

Message #109 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Rudolf Adamkovič <salutis <at> me.com>
Cc: Gregory Heytings <gregory <at> heytings.org>, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 04:05:56 +0100

Rudolf Adamkovič <salutis <at> me.com> writes:

> Works here too, but the function still increases the font size right
> after I execute it.
>
> In other words, to have *no change* in font size, I have do:
>
> 1. type `M-x' and `global-text-scale-adjust' and `RET'
> 2. type `-'
> 3. type `q'
>
> `text-scale-adjust' does this too, so I guess ... a feature?

I guess the idea is that you should invoke it with `C-x C-M-0'?  But
that seems to have another problem with the patch - when I type it I
get:

Debugger entered--Lisp error: (error "Lisp nesting exceeds
‘max-lisp-eval-depth’")
  redisplay--unhighlight-overlay-function(nil)
  redisplay--update-region-highlight(#<window 3 on *scratch*>)
  run-hook-with-args(redisplay--update-region-highlight #<window 3 on
*scratch*>)
  redisplay--pre-redisplay-functions(nil)
  redisplay_internal\ \(C\ function\)()
  redisplay(force)
  global-text-scale-adjust(1)
[[[... 1590 identical lines elided /SK ...]]
  global-text-scale-adjust(1)
  funcall-interactively(global-text-scale-adjust 1)
  call-interactively(global-text-scale-adjust nil nil)
  command-execute(global-text-scale-adjust)

> Also, the two function now scale super-duper differently. :-/

Do you mean 'text-scale-adjust' and 'global-text-scale-adjust'?  I see
the same here.

Message #112 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Rudolf Adamkovič <salutis <at> me.com>
Cc: gregory <at> heytings.org, 59122 <at> debbugs.gnu.org, stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 08:57:56 +0200

> Cc: 59122 <at> debbugs.gnu.org
> Date: Sun, 13 Nov 2022 01:23:58 +0100
> From:  Rudolf Adamkovič via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> Stefan Kangas <stefankangas <at> gmail.com> writes:
> 
> > Thanks, I can confirm that this patch works.
> 
> Works here too, but the function still increases the font size right
> after I execute it.

This is the intended behavior, so no need to try to "fix" it.

> In other words, to have *no change* in font size, I have do:
> 
> 1. type `M-x' and `global-text-scale-adjust' and `RET'
> 2. type `-'
> 3. type `q'
> 
> `text-scale-adjust' does this too, so I guess ... a feature?

Yes, but why would you need to invoke the command if you don't want to
change the size of the font?  What kind of use case is that?

Message #115 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 59122 <at> debbugs.gnu.org, gregory <at> heytings.org, salutis <at> me.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 08:59:15 +0200

> Cc: Gregory Heytings <gregory <at> heytings.org>, 59122 <at> debbugs.gnu.org
> From: Stefan Kangas <stefankangas <at> gmail.com>
> Date: Sun, 13 Nov 2022 04:05:56 +0100
> 
> Rudolf Adamkovič <salutis <at> me.com> writes:
> 
> > Works here too, but the function still increases the font size right
> > after I execute it.
> >
> > In other words, to have *no change* in font size, I have do:
> >
> > 1. type `M-x' and `global-text-scale-adjust' and `RET'
> > 2. type `-'
> > 3. type `q'
> >
> > `text-scale-adjust' does this too, so I guess ... a feature?
> 
> I guess the idea is that you should invoke it with `C-x C-M-0'?  But
> that seems to have another problem with the patch - when I type it I
> get:
> 
> Debugger entered--Lisp error: (error "Lisp nesting exceeds
> ‘max-lisp-eval-depth’")

I cannot reproduce this error, "C-x C-M-0" works as expected here.

Do you see this in "emacs -Q"?

Message #118 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 59122 <at> debbugs.gnu.org, Rudolf Adamkovič <salutis <at> me.com>,
 stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 09:10:03 +0000

>> In other words, to have *no change* in font size, I have do:
>>
>> 1. type `M-x' and `global-text-scale-adjust' and `RET'
>> 2. type `-'
>> 3. type `q'
>>
>> `text-scale-adjust' does this too, so I guess ... a feature?
>
> Yes, but why would you need to invoke the command if you don't want to 
> change the size of the font?  What kind of use case is that?
>

For the sake of completeness: these commands are meant to be used with 
their bindings, which are

C-<wheel-up> / C-<wheel-down> / C-x C-- / C-x C-+ / C-x C-0 / C-x C-=

and

C-M-<wheel-up> / C-M-<wheel-down> / C-x C-M-- / C-x C-M-+ / C-x C-M-0 / C-x C-M-=

Message #121 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 59122 <at> debbugs.gnu.org, Rudolf Adamkovič <salutis <at> me.com>
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 09:18:00 +0000

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

>
> I guess the idea is that you should invoke it with `C-x C-M-0'?  But 
> that seems to have another problem with the patch - when I type it I 
> get:
>

Thanks.  This bug is fixed in the attached patch.

>> Also, the two function now scale super-duper differently. :-/
>
> Do you mean 'text-scale-adjust' and 'global-text-scale-adjust'?  I see 
> the same here.
>

Yes.  As I said earlier, global-text-scale-adjust scales smoothly, and 
text-scale-adjust scales fast.  That was a design choice when implementing 
global-text-scale-adjust.  It should of course be possible to make 
text-scale-adjust scale smoothly too.

[Fix-global-face-scaling-bug-due-to-rounding.patch (text/x-diff, attachment)]

Message #124 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 59122 <at> debbugs.gnu.org, gregory <at> heytings.org, salutis <at> me.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 05:06:02 -0800

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Debugger entered--Lisp error: (error "Lisp nesting exceeds
>> ‘max-lisp-eval-depth’")
>
> I cannot reproduce this error, "C-x C-M-0" works as expected here.

I only tried reproducing it on macOS, so it could be macOS specific.

> Do you see this in "emacs -Q"?

Yes.

Message #127 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: 59122 <at> debbugs.gnu.org, Rudolf Adamkovič <salutis <at> me.com>
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 05:48:26 -0800

Gregory Heytings <gregory <at> heytings.org> writes:

> Thanks.  This bug is fixed in the attached patch.

I can verify that the bug is fixed in that patch.  Thanks.

> It should of course be possible to make text-scale-adjust scale
> smoothly too.

I think that would be good, to make things more consistent.  Even better
if we could customize the step size, and/or the method of scaling for
both commands.  One defcustom could be shared by both.

Message #130 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: salutis <at> me.com, gregory <at> heytings.org, 59122 <at> debbugs.gnu.org
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 18:33:35 +0200

> Cc: 59122 <at> debbugs.gnu.org, Rudolf Adamkovič <salutis <at> me.com>
> From: Stefan Kangas <stefankangas <at> gmail.com>
> Date: Sun, 13 Nov 2022 05:48:26 -0800
> 
> Gregory Heytings <gregory <at> heytings.org> writes:
> 
> > Thanks.  This bug is fixed in the attached patch.
> 
> I can verify that the bug is fixed in that patch.  Thanks.
> 
> > It should of course be possible to make text-scale-adjust scale
> > smoothly too.
> 
> I think that would be good, to make things more consistent.  Even better
> if we could customize the step size, and/or the method of scaling for
> both commands.  One defcustom could be shared by both.

The change in text-scale-adjust should be backward-compatible by
default, otherwise I'll object to it.

Message #133 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 59122 <at> debbugs.gnu.org, salutis <at> me.com,
 Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 19:39:48 +0000

>>> It should of course be possible to make text-scale-adjust scale 
>>> smoothly too.
>>
>> I think that would be good, to make things more consistent.  Even 
>> better if we could customize the step size, and/or the method of 
>> scaling for both commands.  One defcustom could be shared by both.
>
> The change in text-scale-adjust should be backward-compatible by 
> default, otherwise I'll object to it.
>

I know.  And I don't see how to reconcile the two conflicting goals here: 
Stefan K wants consistence, you want backward compatibility.

Message #136 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Gregory Heytings <gregory <at> heytings.org>
Cc: 59122 <at> debbugs.gnu.org, salutis <at> me.com, stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 22:09:19 +0200

> Date: Sun, 13 Nov 2022 19:39:48 +0000
> From: Gregory Heytings <gregory <at> heytings.org>
> cc: Stefan Kangas <stefankangas <at> gmail.com>, salutis <at> me.com, 
>     59122 <at> debbugs.gnu.org
> 
> 
> >>> It should of course be possible to make text-scale-adjust scale 
> >>> smoothly too.
> >>
> >> I think that would be good, to make things more consistent.  Even 
> >> better if we could customize the step size, and/or the method of 
> >> scaling for both commands.  One defcustom could be shared by both.
> >
> > The change in text-scale-adjust should be backward-compatible by 
> > default, otherwise I'll object to it.
> >
> 
> I know.  And I don't see how to reconcile the two conflicting goals here: 
> Stefan K wants consistence, you want backward compatibility.

If the consistent operation is opt-in, I won't object.

Message #139 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Rudolf Adamkovič <salutis <at> me.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: gregory <at> heytings.org, 59122 <at> debbugs.gnu.org, stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sun, 13 Nov 2022 23:37:23 +0100

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Works here too, but the function still increases the font size right
>> after I execute it.
>
> This is the intended behavior, so no need to try to "fix" it.

I see.  I apologize for the noise, then.

>> In other words, to have *no change* in font size, I have do:
>> 
>> 1. type `M-x' and `global-text-scale-adjust' and `RET'
>> 2. type `-'
>> 3. type `q'
>> 
>> `text-scale-adjust' does this too, so I guess ... a feature?
>
> Yes, but why would you need to invoke the command if you don't want to
> change the size of the font?  What kind of use case is that?

Statistically, half of the time, when I invoke the command, I want to
make the font smaller.  In that case, making the font larger first leads
to both confusion and at least one unnecessary key press.

Rudy
-- 
"The introduction of suitable abstractions is our only mental aid to
organize and master complexity."
-- Edsger Wybe Dijkstra, 1930-2002

Rudolf Adamkovič <salutis <at> me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

Message #142 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: Rudolf Adamkovič via "Bug reports for GNU Emacs, the
 Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
Cc: 59122 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>,
 Rudolf Adamkovič <salutis <at> me.com>, gregory <at> heytings.org,
 stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Mon, 14 Nov 2022 01:00:19 +0100

On Sun, 13 Nov 2022 23:37:23 +0100 Rudolf Adamkovič via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org> wrote:

> Eli Zaretskii <eliz <at> gnu.org> writes:
>
>>> Works here too, but the function still increases the font size right
>>> after I execute it.
>>
>> This is the intended behavior, so no need to try to "fix" it.
>
> I see.  I apologize for the noise, then.
>
>>> In other words, to have *no change* in font size, I have do:
>>> 
>>> 1. type `M-x' and `global-text-scale-adjust' and `RET'
>>> 2. type `-'
>>> 3. type `q'
>>> 
>>> `text-scale-adjust' does this too, so I guess ... a feature?
>>
>> Yes, but why would you need to invoke the command if you don't want to
>> change the size of the font?  What kind of use case is that?
>
> Statistically, half of the time, when I invoke the command, I want to
> make the font smaller.  In that case, making the font larger first leads
> to both confusion and at least one unnecessary key press.

Invoking it like this: `M-- M-x global-text-scale-adjust' shrinks the
font size.

Steve Berman

Message #148 received at 59122 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Rudolf Adamkovič <salutis <at> me.com>
Cc: gregory <at> heytings.org, 59122 <at> debbugs.gnu.org, stefankangas <at> gmail.com
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Mon, 14 Nov 2022 05:31:41 +0200

> From: Rudolf Adamkovič <salutis <at> me.com>
> Cc: stefankangas <at> gmail.com, gregory <at> heytings.org, 59122 <at> debbugs.gnu.org
> Date: Sun, 13 Nov 2022 23:37:23 +0100
> 
> > Yes, but why would you need to invoke the command if you don't want to
> > change the size of the font?  What kind of use case is that?
> 
> Statistically, half of the time, when I invoke the command, I want to
> make the font smaller.  In that case, making the font larger first leads
> to both confusion and at least one unnecessary key press.

That still doesn't explain why you'd invoke the command with the zero
prefix argument.  I'd expect you to invoke it with a negative argument
instead.

Message #153 received at 59122-done <at> debbugs.gnu.org (full text, mbox):

From: Gregory Heytings <gregory <at> heytings.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 59122-done <at> debbugs.gnu.org, salutis <at> me.com,
 Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#59122: 29.0.50; global-text-scale-adjust not working
Date: Sat, 19 Nov 2022 15:52:27 +0000

Pushed, and closing.

I also updated the docstrings of global-text-scale-adjust and 
text-scale-adjust.  Making text-scale-adjust behave like 
global-text-scale-adjust only requires to set text-scale-mode-step to a 
small enough factor, so it's unnecessary to add another defcustom.

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