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Subject: bug#79906: buffer-face-mode causes box glyphs with text-scale-adjust after font change
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When I change the font using buffer-face-mode-invoke, I get a set of boxes=
=20
when I use text scale with text-scale-adjust or mouse.
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Heime <heimeborgia@HIDDEN> Subject: bug#79906: Acknowledgement (buffer-face-mode causes box glyphs with text-scale-adjust after font change) Message-ID: <handler.79906.B.17643237316832.ack <at> debbugs.gnu.org> References: <Dbs9RcvjPI-goGwbUwwzMsE_3PTK-GOZtJWur2rN5To99IRGVQWJIVDbuGvCw6iU2r3cJzUY8Fy2oa8amPWCX-WZYzeD7M_DKJrQR6HasBI=@protonmail.com> X-Gnu-PR-Message: ack 79906 X-Gnu-PR-Package: emacs Reply-To: 79906 <at> debbugs.gnu.org Date: Fri, 28 Nov 2025 09:56:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 79906 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 79906: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D79906 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#79906: buffer-face-mode causes box glyphs with text-scale-adjust after font change
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> Date: Fri, 28 Nov 2025 09:55:08 +0000
> From: Heime via "Bug reports for GNU Emacs,
> the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>
> When I change the font using buffer-face-mode-invoke, I get a set of boxes
> when I use text scale with text-scale-adjust or mouse.
This most probably means you used a font that cannot support ASCII and
Latin characters (in which case this isn't an Emacs bug, this is your
mistake). In any case, please show a complete recipe for reproducing
the problem starting from "emacs -Q".
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Subject: bug#79906: buffer-face-mode causes box glyphs with text-scale-adjust after font change
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On Friday, November 28th, 2025 at 11:42 PM, Eli Zaretskii <eliz@HIDDEN> wr=
ote:
> > Date: Fri, 28 Nov 2025 09:55:08 +0000
>=20
> > From: Heime via "Bug reports for GNU Emacs,
> > the Swiss army knife of text editors" bug-gnu-emacs@HIDDEN
> >=20
> > When I change the font using buffer-face-mode-invoke, I get a set of bo=
xes
> > when I use text scale with text-scale-adjust or mouse.
>=20
>=20
> This most probably means you used a font that cannot support ASCII and
> Latin characters (in which case this isn't an Emacs bug, this is your
> mistake). In any case, please show a complete recipe for reproducing
> the problem starting from "emacs -Q".
I changed the font and the code is properly displayed. Only when the scale
changes does the problem occur. When I revert to the original scale, the
text is displayed correctly again.
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Subject: bug#79906: buffer-face-mode causes box glyphs with text-scale-adjust after font change
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(message from Heime on Fri, 28 Nov 2025 11:46:05 +0000)
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> Date: Fri, 28 Nov 2025 11:46:05 +0000
> From: Heime <heimeborgia@HIDDEN>
> Cc: 79906 <at> debbugs.gnu.org
>
> On Friday, November 28th, 2025 at 11:42 PM, Eli Zaretskii <eliz@HIDDEN> wrote:
>
> > > Date: Fri, 28 Nov 2025 09:55:08 +0000
> >
> > > From: Heime via "Bug reports for GNU Emacs,
> > > the Swiss army knife of text editors" bug-gnu-emacs@HIDDEN
> > >
> > > When I change the font using buffer-face-mode-invoke, I get a set of boxes
> > > when I use text scale with text-scale-adjust or mouse.
> >
> >
> > This most probably means you used a font that cannot support ASCII and
> > Latin characters (in which case this isn't an Emacs bug, this is your
> > mistake). In any case, please show a complete recipe for reproducing
> > the problem starting from "emacs -Q".
>
> I changed the font and the code is properly displayed. Only when the scale
> changes does the problem occur. When I revert to the original scale, the
> text is displayed correctly again.
Which font is that? And how did you tell Emacs to use it?
Once again, please show a full detailed recipe starting from "emacs -Q".
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Subject: bug#79906: buffer-face-mode causes box glyphs with text-scale-adjust after font change
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On Friday, November 28th, 2025 at 11:58 PM, Eli Zaretskii <eliz@HIDDEN> wr=
ote:
> > Date: Fri, 28 Nov 2025 11:46:05 +0000
>=20
> > From: Heime heimeborgia@HIDDEN
> > Cc: 79906 <at> debbugs.gnu.org
> >=20
> > On Friday, November 28th, 2025 at 11:42 PM, Eli Zaretskii eliz@HIDDEN =
wrote:
> >=20
> > > > Date: Fri, 28 Nov 2025 09:55:08 +0000
> > >=20
> > > > From: Heime via "Bug reports for GNU Emacs,
> > > > the Swiss army knife of text editors" bug-gnu-emacs@HIDDEN
> > > >=20
> > > > When I change the font using buffer-face-mode-invoke, I get a set o=
f boxes
> > > > when I use text scale with text-scale-adjust or mouse.
> > >=20
> > > This most probably means you used a font that cannot support ASCII an=
d
> > > Latin characters (in which case this isn't an Emacs bug, this is your
> > > mistake). In any case, please show a complete recipe for reproducing
> > > the problem starting from "emacs -Q".
> >=20
> > I changed the font and the code is properly displayed. Only when the sc=
ale
> > changes does the problem occur. When I revert to the original scale, th=
e
> > text is displayed correctly again.
>=20
>=20
> Which font is that? And how did you tell Emacs to use it?
>=20
> Once again, please show a full detailed recipe starting from "emacs -Q".
Here is the function. If I select a STIX font variant, contrary to=20
expectation, the modeline font also gets changed. =20
(defun font-apply (font)
"Apply any available font variant to the current buffer, or
reset to the system default font when default is selected."
=20
(interactive
(let* ( (familt (completing-read "[Rotv] Family: "
(cons "default" (font-family-list)) nil t))
(dflt (string=3D familt "default")) )
(if dflt
(list nil) ; Pass nil to indicate default/reset
;; Allow user to select specific font variant
(let* ( (fntl (list-fonts (font-spec :family familt)))
(fsrpl (mapcar
(lambda (font) (format "%s" font))
=09=09=09 fntl)) )
(if fntl
;; FNTL Non-Empty - Let user specify font=20
(let ( (fsrp (completing-read
"Font Sel: " fsrpl nil t)) )
;; Convert font string back to font object
(list (seq-find
(lambda (f) (string=3D (format "%s" f) fsrp))
fntl)))
;; FNTL Empty
(message "No fonts found for family: %s" familt))))))
;; -------------------------------------------------------------
;; fuente
(message "font: %S" font)
(if font
;; Apply font to the current buffer
(buffer-face-mode 1)
(buffer-face-mode-invoke `(:font ,font) t)
;; Disable buffer-face-mode (nil,reset)
(buffer-face-mode -1)))
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Subject: bug#79906: buffer-face-mode causes box glyphs with text-scale-adjust after font change
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Date: Fri, 28 Nov 2025 16:30:43 +0200
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(message from Heime on Fri, 28 Nov 2025 12:43:02 +0000)
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> Date: Fri, 28 Nov 2025 12:43:02 +0000
> From: Heime <heimeborgia@HIDDEN>
> Cc: 79906 <at> debbugs.gnu.org
>
>
> On Friday, November 28th, 2025 at 11:58 PM, Eli Zaretskii <eliz@HIDDEN> wrote:
>
> > > Date: Fri, 28 Nov 2025 11:46:05 +0000
> >
> > > From: Heime heimeborgia@HIDDEN
> > > Cc: 79906 <at> debbugs.gnu.org
> > >
> > > On Friday, November 28th, 2025 at 11:42 PM, Eli Zaretskii eliz@HIDDEN wrote:
> > >
> > > > > Date: Fri, 28 Nov 2025 09:55:08 +0000
> > > >
> > > > > From: Heime via "Bug reports for GNU Emacs,
> > > > > the Swiss army knife of text editors" bug-gnu-emacs@HIDDEN
> > > > >
> > > > > When I change the font using buffer-face-mode-invoke, I get a set of boxes
> > > > > when I use text scale with text-scale-adjust or mouse.
> > > >
> > > > This most probably means you used a font that cannot support ASCII and
> > > > Latin characters (in which case this isn't an Emacs bug, this is your
> > > > mistake). In any case, please show a complete recipe for reproducing
> > > > the problem starting from "emacs -Q".
> > >
> > > I changed the font and the code is properly displayed. Only when the scale
> > > changes does the problem occur. When I revert to the original scale, the
> > > text is displayed correctly again.
> >
> >
> > Which font is that? And how did you tell Emacs to use it?
> >
> > Once again, please show a full detailed recipe starting from "emacs -Q".
>
> Here is the function. If I select a STIX font variant, contrary to
> expectation, the modeline font also gets changed.
And which font causes empty boxes to be displayed when you change the
text scale?
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On Saturday, November 29th, 2025 at 2:32 AM, Eli Zaretskii <eliz@HIDDEN> w=
rote:
>=20
>=20
> > Date: Fri, 28 Nov 2025 12:43:02 +0000
>=20
> > From: Heime heimeborgia@HIDDEN
> > Cc: 79906 <at> debbugs.gnu.org
> >=20
> > On Friday, November 28th, 2025 at 11:58 PM, Eli Zaretskii eliz@HIDDEN =
wrote:
> >=20
> > > > Date: Fri, 28 Nov 2025 11:46:05 +0000
> > >=20
> > > > From: Heime heimeborgia@HIDDEN
> > > > Cc: 79906 <at> debbugs.gnu.org
> > > >=20
> > > > On Friday, November 28th, 2025 at 11:42 PM, Eli Zaretskii eliz@gnu.=
org wrote:
> > > >=20
> > > > > > Date: Fri, 28 Nov 2025 09:55:08 +0000
> > > > >=20
> > > > > > From: Heime via "Bug reports for GNU Emacs,
> > > > > > the Swiss army knife of text editors" bug-gnu-emacs@HIDDEN
> > > > > >=20
> > > > > > When I change the font using buffer-face-mode-invoke, I get a s=
et of boxes
> > > > > > when I use text scale with text-scale-adjust or mouse.
> > > > >=20
> > > > > This most probably means you used a font that cannot support ASCI=
I and
> > > > > Latin characters (in which case this isn't an Emacs bug, this is =
your
> > > > > mistake). In any case, please show a complete recipe for reproduc=
ing
> > > > > the problem starting from "emacs -Q".
> > > >=20
> > > > I changed the font and the code is properly displayed. Only when th=
e scale
> > > > changes does the problem occur. When I revert to the original scale=
, the
> > > > text is displayed correctly again.
> > >=20
> > > Which font is that? And how did you tell Emacs to use it?
> > >=20
> > > Once again, please show a full detailed recipe starting from "emacs -=
Q".
> >=20
> > Here is the function. If I select a STIX font variant, contrary to
> > expectation, the modeline font also gets changed.
>=20
>=20
> And which font causes empty boxes to be displayed when you change the
> text scale?
Have not figured out what replicates it. Have also seen that some *Mono*
fonts like "Tlwg Mono" and "Liberation Mono" do not scale at all.
I also get errors=20
font: #<font-entity ftcrhb urw Nimbus\ Mono\ PS nil iso10646-1 bold italic =
normal 0 nil 100 0>
Invalid face attribute :font nil [114 times]
default-line-height: Wrong type argument: stringp, nilInvalid face attribut=
e :font nil [3 times]
Invalid face attribute :font nil [6 times]
default-line-height: Wrong type argument: stringp, nilInvalid face attribut=
e :font nil [3 times]
Invalid face attribute :font nil [4 times]
default-line-height: Wrong type argument: stringp, nilInvalid face attribut=
e :font nil [13 times]
default-line-height: Wrong type argument: stringp, nil
X-Loop: help-debbugs@HIDDEN
Subject: bug#79906: buffer-face-mode causes box glyphs with text-scale-adjust after font change
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Date: Fri, 28 Nov 2025 19:11:27 +0200
Message-Id: <86pl9284lc.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
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(message from Heime on Fri, 28 Nov 2025 15:48:22 +0000)
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> Date: Fri, 28 Nov 2025 15:48:22 +0000
> From: Heime <heimeborgia@HIDDEN>
> Cc: 79906 <at> debbugs.gnu.org
>
>
>
>
>
>
> Sent with Proton Mail secure email.
>
> On Saturday, November 29th, 2025 at 2:32 AM, Eli Zaretskii <eliz@HIDDEN> wrote:
>
> >
> >
> > > Date: Fri, 28 Nov 2025 12:43:02 +0000
> >
> > > From: Heime heimeborgia@HIDDEN
> > > Cc: 79906 <at> debbugs.gnu.org
> > >
> > > On Friday, November 28th, 2025 at 11:58 PM, Eli Zaretskii eliz@HIDDEN wrote:
> > >
> > > > > Date: Fri, 28 Nov 2025 11:46:05 +0000
> > > >
> > > > > From: Heime heimeborgia@HIDDEN
> > > > > Cc: 79906 <at> debbugs.gnu.org
> > > > >
> > > > > On Friday, November 28th, 2025 at 11:42 PM, Eli Zaretskii eliz@HIDDEN wrote:
> > > > >
> > > > > > > Date: Fri, 28 Nov 2025 09:55:08 +0000
> > > > > >
> > > > > > > From: Heime via "Bug reports for GNU Emacs,
> > > > > > > the Swiss army knife of text editors" bug-gnu-emacs@HIDDEN
> > > > > > >
> > > > > > > When I change the font using buffer-face-mode-invoke, I get a set of boxes
> > > > > > > when I use text scale with text-scale-adjust or mouse.
> > > > > >
> > > > > > This most probably means you used a font that cannot support ASCII and
> > > > > > Latin characters (in which case this isn't an Emacs bug, this is your
> > > > > > mistake). In any case, please show a complete recipe for reproducing
> > > > > > the problem starting from "emacs -Q".
> > > > >
> > > > > I changed the font and the code is properly displayed. Only when the scale
> > > > > changes does the problem occur. When I revert to the original scale, the
> > > > > text is displayed correctly again.
> > > >
> > > > Which font is that? And how did you tell Emacs to use it?
> > > >
> > > > Once again, please show a full detailed recipe starting from "emacs -Q".
> > >
> > > Here is the function. If I select a STIX font variant, contrary to
> > > expectation, the modeline font also gets changed.
> >
> >
> > And which font causes empty boxes to be displayed when you change the
> > text scale?
>
>
> Have not figured out what replicates it. Have also seen that some *Mono*
> fonts like "Tlwg Mono" and "Liberation Mono" do not scale at all.
>
> I also get errors
>
> font: #<font-entity ftcrhb urw Nimbus\ Mono\ PS nil iso10646-1 bold italic normal 0 nil 100 0>
> Invalid face attribute :font nil [114 times]
> default-line-height: Wrong type argument: stringp, nilInvalid face attribute :font nil [3 times]
> Invalid face attribute :font nil [6 times]
> default-line-height: Wrong type argument: stringp, nilInvalid face attribute :font nil [3 times]
> Invalid face attribute :font nil [4 times]
> default-line-height: Wrong type argument: stringp, nilInvalid face attribute :font nil [13 times]
> default-line-height: Wrong type argument: stringp, nil
I need a full recipe, that is the complete description of all the
steps after starting "emacs -Q", which leads to each of these
problems. That includes the font(s) which you choose using your
function, and which then lead to the above error messages. So far,
you have presented only some of the pieces of the puzzle, and it is
impossible to investigate given the information you provided, because
there are gaps that cannot be filled.
X-Loop: help-debbugs@HIDDEN
Subject: bug#79906: buffer-face-mode causes box glyphs with text-scale-adjust after font change
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On Saturday, November 29th, 2025 at 5:12 AM, Eli Zaretskii <eliz@HIDDEN> w=
rote:
> > Date: Fri, 28 Nov 2025 15:48:22 +0000
>=20
> > From: Heime heimeborgia@HIDDEN
> > Cc: 79906 <at> debbugs.gnu.org
> >=20
> > Sent with Proton Mail secure email.
> >=20
> > On Saturday, November 29th, 2025 at 2:32 AM, Eli Zaretskii eliz@HIDDEN=
wrote:
> >=20
> > > > Date: Fri, 28 Nov 2025 12:43:02 +0000
> > >=20
> > > > From: Heime heimeborgia@HIDDEN
> > > > Cc: 79906 <at> debbugs.gnu.org
> > > >=20
> > > > On Friday, November 28th, 2025 at 11:58 PM, Eli Zaretskii eliz@gnu.=
org wrote:
> > > >=20
> > > > > > Date: Fri, 28 Nov 2025 11:46:05 +0000
> > > > >=20
> > > > > > From: Heime heimeborgia@HIDDEN
> > > > > > Cc: 79906 <at> debbugs.gnu.org
> > > > > >=20
> > > > > > On Friday, November 28th, 2025 at 11:42 PM, Eli Zaretskii eliz@=
gnu.org wrote:
> > > > > >=20
> > > > > > > > Date: Fri, 28 Nov 2025 09:55:08 +0000
> > > > > > >=20
> > > > > > > > From: Heime via "Bug reports for GNU Emacs,
> > > > > > > > the Swiss army knife of text editors" bug-gnu-emacs@HIDDEN
> > > > > > > >=20
> > > > > > > > When I change the font using buffer-face-mode-invoke, I get=
a set of boxes
> > > > > > > > when I use text scale with text-scale-adjust or mouse.
> > > > > > >=20
> > > > > > > This most probably means you used a font that cannot support =
ASCII and
> > > > > > > Latin characters (in which case this isn't an Emacs bug, this=
is your
> > > > > > > mistake). In any case, please show a complete recipe for repr=
oducing
> > > > > > > the problem starting from "emacs -Q".
> > > > > >=20
> > > > > > I changed the font and the code is properly displayed. Only whe=
n the scale
> > > > > > changes does the problem occur. When I revert to the original s=
cale, the
> > > > > > text is displayed correctly again.
> > > > >=20
> > > > > Which font is that? And how did you tell Emacs to use it?
> > > > >=20
> > > > > Once again, please show a full detailed recipe starting from "ema=
cs -Q".
> > > >=20
> > > > Here is the function. If I select a STIX font variant, contrary to
> > > > expectation, the modeline font also gets changed.
> > >=20
> > > And which font causes empty boxes to be displayed when you change the
> > > text scale?
> >=20
> > Have not figured out what replicates it. Have also seen that some Mono
> > fonts like "Tlwg Mono" and "Liberation Mono" do not scale at all.
> >=20
> > I also get errors
> >=20
> > font: #<font-entity ftcrhb urw Nimbus\ Mono\ PS nil iso10646-1 bold ita=
lic normal 0 nil 100 0>
> > Invalid face attribute :font nil [114 times]
> > default-line-height: Wrong type argument: stringp, nilInvalid face attr=
ibute :font nil [3 times]
> > Invalid face attribute :font nil [6 times]
> > default-line-height: Wrong type argument: stringp, nilInvalid face attr=
ibute :font nil [3 times]
> > Invalid face attribute :font nil [4 times]
> > default-line-height: Wrong type argument: stringp, nilInvalid face attr=
ibute :font nil [13 times]
> > default-line-height: Wrong type argument: stringp, nil
>=20
>=20
> I need a full recipe, that is the complete description of all the
> steps after starting "emacs -Q", which leads to each of these
> problems. That includes the font(s) which you choose using your
> function, and which then lead to the above error messages. So far,
> you have presented only some of the pieces of the puzzle, and it is
> impossible to investigate given the information you provided, because
> there are gaps that cannot be filled.
First I call the function with family STIX selecting
font: #<font-entity ftcrhb STIX STIX nil iso10646-1 regular normal normal 0=
nil nil 0>
Then I rerun using option default, which gives me
Invalid face attribute :font nil
Then rerunning again with family STIX selecting
font: #<font-entity ftcrhb STIX STIX nil iso10646-1 regular normal normal 0=
nil nil 0>
gives
Invalid face attribute :font nil [416 times]
When I try to scale I get more
Invalid face attribute :font nil [416 times]
X-Loop: help-debbugs@HIDDEN
Subject: bug#79906: buffer-face-mode causes box glyphs with text-scale-adjust after font change
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> Date: Fri, 28 Nov 2025 17:56:52 +0000
> From: Heime <heimeborgia@HIDDEN>
> Cc: 79906 <at> debbugs.gnu.org
>
> First I call the function with family STIX selecting
> font: #<font-entity ftcrhb STIX STIX nil iso10646-1 regular normal normal 0 nil nil 0>
>
> Then I rerun using option default, which gives me
> Invalid face attribute :font nil
There is no font or font family named "default", so this is just a
cockpit error, AFAIU.
> Then rerunning again with family STIX selecting
> font: #<font-entity ftcrhb STIX STIX nil iso10646-1 regular normal normal 0 nil nil 0>
>
> gives
>
> Invalid face attribute :font nil [416 times]
>
> When I try to scale I get more
>
> Invalid face attribute :font nil [416 times]
Once you set a non-existing font "default", these errors will
continue. Don't do that.
X-Loop: help-debbugs@HIDDEN
Subject: bug#79906: buffer-face-mode causes box glyphs with text-scale-adjust after font change
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From: Eli Zaretskii <eliz@HIDDEN>
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> Cc: 79906 <at> debbugs.gnu.org
> Date: Sat, 29 Nov 2025 09:33:20 +0200
> From: Eli Zaretskii <eliz@HIDDEN>
>
> > Date: Fri, 28 Nov 2025 17:56:52 +0000
> > From: Heime <heimeborgia@HIDDEN>
> > Cc: 79906 <at> debbugs.gnu.org
> >
> > First I call the function with family STIX selecting
> > font: #<font-entity ftcrhb STIX STIX nil iso10646-1 regular normal normal 0 nil nil 0>
> >
> > Then I rerun using option default, which gives me
> > Invalid face attribute :font nil
>
> There is no font or font family named "default", so this is just a
> cockpit error, AFAIU.
>
> > Then rerunning again with family STIX selecting
> > font: #<font-entity ftcrhb STIX STIX nil iso10646-1 regular normal normal 0 nil nil 0>
> >
> > gives
> >
> > Invalid face attribute :font nil [416 times]
> >
> > When I try to scale I get more
> >
> > Invalid face attribute :font nil [416 times]
>
> Once you set a non-existing font "default", these errors will
> continue. Don't do that.
Note that you are calling buffer-face-mode-invoke with a font-entity
object:
#<font-entity ftcrhb STIX STIX nil iso10646-1 regular normal normal 0 nil nil 0>
whereas what it wants is a font-spec object. So either use
font-face-attributes to generate an object of the correct type and
form, or (better) use (font-spec :family FAMILY), where FAMILY is
selected by the user, without asking the user to also select a font
from the family (which could only confuse users and cause incorrect
results).
There is another problem is in your function, here:
(let ( (fsrp (completing-read
"Font Sel: " fsrpl nil t)) )
;; Convert font string back to font object
(list (seq-find
(lambda (f) (string= (format "%s" f) fsrp))
fntl)))
The call to seq-find can return nil, and your code doesn't check for
that.
One other, more significant, problem is here:
(if font
;; Apply font to the current buffer
(buffer-face-mode 1)
(buffer-face-mode-invoke `(:font ,font) t)
;; Disable buffer-face-mode (nil,reset)
(buffer-face-mode -1)))
I think you meant this instead:
(if font
;; Apply font to the current buffer
(progn
(buffer-face-mode 1)
(buffer-face-mode-invoke `(:font ,font) t))
;; Disable buffer-face-mode (nil,reset)
(buffer-face-mode -1)))
IOW, your program has multiple unresolved problems, so you should fix
them, and only then consider the possibility that there's a bug in
Emacs.
FWIW, the call
(buffer-face-mode-invoke (list :font (font-spec :family "Cascadia Code")) t)
succeeds here and produces the expected effect, so the basic
functionality works, and the problems are entirely in how your
function calls the relevant APIs.
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Subject: bug#79906: buffer-face-mode causes box glyphs with text-scale-adjust after font change
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On Saturday, November 29th, 2025 at 9:13 PM, Eli Zaretskii <eliz@HIDDEN> w=
rote:
> > Cc: 79906 <at> debbugs.gnu.org
>=20
> > Date: Sat, 29 Nov 2025 09:33:20 +0200
> > From: Eli Zaretskii eliz@HIDDEN
> >=20
> > > Date: Fri, 28 Nov 2025 17:56:52 +0000
> > > From: Heime heimeborgia@HIDDEN
> > > Cc: 79906 <at> debbugs.gnu.org
> > >=20
> > > First I call the function with family STIX selecting
> > > font: #<font-entity ftcrhb STIX STIX nil iso10646-1 regular normal no=
rmal 0 nil nil 0>
> > >=20
> > > Then I rerun using option default, which gives me
> > > Invalid face attribute :font nil
> >=20
> > There is no font or font family named "default", so this is just a
> > cockpit error, AFAIU.
> >=20
> > > Then rerunning again with family STIX selecting
> > > font: #<font-entity ftcrhb STIX STIX nil iso10646-1 regular normal no=
rmal 0 nil nil 0>
> > >=20
> > > gives
> > >=20
> > > Invalid face attribute :font nil [416 times]
> > >=20
> > > When I try to scale I get more
> > >=20
> > > Invalid face attribute :font nil [416 times]
> >=20
> > Once you set a non-existing font "default", these errors will
> > continue. Don't do that.
>=20
>=20
> Note that you are calling buffer-face-mode-invoke with a font-entity
> object:
>=20
> #<font-entity ftcrhb STIX STIX nil iso10646-1 regular normal normal 0 nil=
nil 0>
>=20
>=20
> whereas what it wants is a font-spec object. So either use
> font-face-attributes to generate an object of the correct type and
> form, or (better) use (font-spec :family FAMILY), where FAMILY is
> selected by the user, without asking the user to also select a font
> from the family (which could only confuse users and cause incorrect
> results).
I could not get the font-face-attributes docstring with Emacs 30.0.92.
If I use just the family, the user would not be able to choose whether
it is regular, bold, italic as can be done with Options-SetDefaultFont.
=20
> There is another problem is in your function, here:
>=20
> (let ( (fsrp (completing-read
> "Font Sel: " fsrpl nil t)) )
> ;; Convert font string back to font object
> (list (seq-find
> (lambda (f) (string=3D (format "%s" f) fsrp))
> fntl)))
>=20
> The call to seq-find can return nil, and your code doesn't check for
> that.
>=20
> One other, more significant, problem is here:
>=20
> (if font
> ;; Apply font to the current buffer
> (buffer-face-mode 1)
> (buffer-face-mode-invoke `(:font ,font) t) ;; Disable buffer-face-mode (n=
il,reset) (buffer-face-mode -1)))=20
> I think you meant this instead:=20
I agree.
> (if font ;; Apply font to the current buffer=20
> (progn (buffer-face-mode 1) (buffer-face-mode-invoke` (:font ,font) t))
> ;; Disable buffer-face-mode (nil,reset)
> (buffer-face-mode -1)))
Does one require (buffer-face-mode 1) before buffer-face-mode-invoke, does
the latter activate buffer-face-mode?
=20
> IOW, your program has multiple unresolved problems, so you should fix
> them, and only then consider the possibility that there's a bug in
> Emacs.
>=20
> FWIW, the call
>=20
> (buffer-face-mode-invoke (list :font (font-spec :family "Cascadia Code"))=
t)
>=20
> succeeds here and produces the expected effect, so the basic
> functionality works, and the problems are entirely in how your
> function calls the relevant APIs.
>
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> Date: Sun, 30 Nov 2025 10:39:14 +0000
> From: Heime <heimeborgia@HIDDEN>
> Cc: 79906 <at> debbugs.gnu.org
>
> > Note that you are calling buffer-face-mode-invoke with a font-entity
> > object:
> >
> > #<font-entity ftcrhb STIX STIX nil iso10646-1 regular normal normal 0 nil nil 0>
> >
> >
> > whereas what it wants is a font-spec object. So either use
> > font-face-attributes to generate an object of the correct type and
> > form, or (better) use (font-spec :family FAMILY), where FAMILY is
> > selected by the user, without asking the user to also select a font
> > from the family (which could only confuse users and cause incorrect
> > results).
>
> I could not get the font-face-attributes docstring with Emacs 30.0.92.
??? That function exists since Emacs 23.
> If I use just the family, the user would not be able to choose whether
> it is regular, bold, italic as can be done with Options-SetDefaultFont.
They shouldn't be allowed to select anything but regular, otherwise
the font will not work well for the buffer.
> > (if font ;; Apply font to the current buffer
> > (progn (buffer-face-mode 1) (buffer-face-mode-invoke` (:font ,font) t))
> > ;; Disable buffer-face-mode (nil,reset)
> > (buffer-face-mode -1)))
>
> Does one require (buffer-face-mode 1) before buffer-face-mode-invoke, does
> the latter activate buffer-face-mode?
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