GNU bug report logs - #42603
EWW shows chars > #xFF with font set by "set-fontset-font"

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Package: emacs; Reported by: Sebastian Urban <mrsebastianurban@HIDDEN>; dated Wed, 29 Jul 2020 16:27:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Sebastian Urban <mrsebastianurban@HIDDEN>
Subject: Re: bug#42603: EWW shows chars > #xFF with font set by
 "set-fontset-font"
To: Eli Zaretskii <eliz@HIDDEN>
References: <3193cd96-a53f-d9da-ab27-0baf01f1b313@HIDDEN>
 <83ft9af9bt.fsf@HIDDEN> <83d04ef8kh.fsf@HIDDEN>
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Date: Fri, 31 Jul 2020 14:01:49 +0200
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>> 2. M-: (set-fontset-font t 'unicode "Times New Roman")
>
> This setting makes no sense: no single font can cover all of Unicode,
> so you should never do that.
>
> Why did you think you needed to do it in your case?

My use case is not related to EWW, but to fonts overall.  I use it to
"prevent" Emacs from searching for fonts, and to display codes of
characters instead of glyphs, to speed up loading text in situations
like in case of view-hello-file.  Then I have a file with Noto Fonts
set according to the script, like this:
    (add-to-list 'default-frame-alist '(font . "Consolas-13"))
    (set-fontset-font "fontset-default" 'unicode "Consolas")
    (set-fontset-font "fontset-default" 'unicode "Symbola" nil 'append)
    (load "noto-fonts.elc")

In this case, I simply spotted this strange behaviour of showing some
chars in my default font (Consolas) instead of variable-pitch (in my
case it's Arial), like "ł", "ą" and "ę" in sentence (see link in my
first message):
Słownik SJP.PL do programów sprawdzających pisownię (...):

When I type C-u C-x = on any of above letters, it says:
    There are text properties here:
      face                 variable-pitch
and the variable-pitch says Arial, but it's not Arial.

>> 3. Watch as some chars change font.
>>
>> The thing is, both unchanged and changed chars have face of
>> variable-pitch ("C-u C-x =" on char), so nothing should change,
>> I think.
>
> I don't think I agree.  Times New Roman doesn't support all of the
> characters.
>
> And in addition, you seem to assume that set-fontset-font overrides
> the frame's default font for the first 256 characters, which isn't
> true, AFAIK.

I think, I'm not assuming that, which I noted:
"1. Open website in EWW with chars above #xFF, e.g.:".
                                    ^^^^^^^^^^

Also, if I understood correctly your interpretation of my message:
I DON'T want to change whole text to TNR, or any other font, with this
command, quite the opposite, I don't want IT to change chars above
256, in EWW buffer that uses variable-pitch font, which is Arial.


S. U.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#42603; Package emacs. Full text available.

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In-Reply-To: <83ft9af9bt.fsf@HIDDEN> (message from Eli Zaretskii on Wed, 29
 Jul 2020 21:46:30 +0300)
Subject: Re: bug#42603: EWW shows chars > #xFF with font set by
 "set-fontset-font"
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> Date: Wed, 29 Jul 2020 21:46:30 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> Cc: 42603 <at> debbugs.gnu.org
> 
> > The thing is, both unchanged and changed chars have face of
> > variable-pitch ("C-u C-x =" on char), so nothing should change,
> > I think.
> 
> I don't think I agree.  Times New Roman doesn't support all of the
> characters.

And in addition, you seem to assume that set-fontset-font overrides
the frame's default font for the first 256 characters, which isn't
true, AFAIK.

In short, you are doing something that Emacs doesn't support, and I
wonder why you needed anything like that.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#42603; Package emacs. Full text available.

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To: Sebastian Urban <mrsebastianurban@HIDDEN>
In-Reply-To: <3193cd96-a53f-d9da-ab27-0baf01f1b313@HIDDEN> (message from
 Sebastian Urban on Wed, 29 Jul 2020 18:26:07 +0200)
Subject: Re: bug#42603: EWW shows chars > #xFF with font set by
 "set-fontset-font"
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> From: Sebastian Urban <mrsebastianurban@HIDDEN>
> Date: Wed, 29 Jul 2020 18:26:07 +0200
> 
> 2. M-: (set-fontset-font t 'unicode "Times New Roman")

This setting makes no sense: no single font can cover all of Unicode,
so you should never do that.

Why did you think you needed to do it in your case?

> 3. Watch as some chars change font.
> 
> The thing is, both unchanged and changed chars have face of
> variable-pitch ("C-u C-x =" on char), so nothing should change,
> I think.

I don't think I agree.  Times New Roman doesn't support all of the
characters.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#42603; Package emacs. Full text available.

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From: Sebastian Urban <mrsebastianurban@HIDDEN>
Subject: EWW shows chars > #xFF with font set by "set-fontset-font"
To: Bug GNU Emacs <bug-gnu-emacs@HIDDEN>
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Hello,

a quick recipe:
1. Open website in EWW with chars above #xFF, e.g.:
    M-x eww RET https://sjp.pl/slownik/ort/ RET
2. M-: (set-fontset-font t 'unicode "Times New Roman")
    ... or any font, other than in variable-pitch face
3. Watch as some chars change font.

The thing is, both unchanged and changed chars have face of
variable-pitch ("C-u C-x =" on char), so nothing should change,
I think.

Something similar happens in:
    M-x list-charset-chars RET unicode-bmp RET
#x00 -> #xFF stays the same, next segments change.

Tested on: GNU Emacs 28.0.50 (build 1, x86_64-w64-mingw32) of
2020-07-05.


S. U.




Acknowledgement sent to Sebastian Urban <mrsebastianurban@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#42603; Package emacs. Full text available.
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