GNU bug report logs - #33207
26.1; Incorrect display of braille unicode

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

From: Justin Heyes-Jones <justinhj <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1; Incorrect display of braille unicode
Date: Tue, 30 Oct 2018 08:50:46 -0700

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

Hi, I'm not sure if this is a bug or if there is some setting related to
the display of unicode that I don't know about.

The problem is that the braille unicode character BRAILLE PATTERN
BLANK (0x2800)
doesn't display as blank but appears as what looks like a different
character. I have submitted a question to stackoverflow which includes
screen shots of what the code should look like in both terminal and in
emacs. I am running on macOS Mojave 10.14.

https://stackoverflow.com/questions/53024626/why-is-emacs-displaying-unicode-character-braille-pattern-blank-as-a-non-blank-c

Thanks!

Justin

In GNU Emacs 26.1 (build 1, x86_64-apple-darwin14.5.0, NS appkit-1348.17
Version 10.10.5 (Build 14F2511))
of 2018-05-30 built on builder10-10.porkrind.org
Windowing system distributor 'Apple', version 10.3.1671
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[Message part 2 (text/html, inline)]

Message #8 received at 33207 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Justin Heyes-Jones <justinhj <at> gmail.com>
Cc: 33207 <at> debbugs.gnu.org
Subject: Re: bug#33207: 26.1; Incorrect display of braille unicode
Date: Tue, 30 Oct 2018 19:31:06 +0200

> Resent-Sender: help-debbugs <at> gnu.org
> From: Justin Heyes-Jones <justinhj <at> gmail.com>
> Date: Tue, 30 Oct 2018 08:50:46 -0700
> 
> The problem is that the braille unicode character BRAILLE PATTERN BLANK (0x2800) doesn't display as
> blank but appears as what looks like a different character. I have submitted a question to stackoverflow which
> includes screen shots of what the code should look like in both terminal and in emacs. I am running on
> macOS Mojave 10.14.

Probably macOS specific: that character displays fine on MS-Windows.

Message #11 received at 33207 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Justin Heyes-Jones <justinhj <at> gmail.com>, 33207 <at> debbugs.gnu.org
Subject: Re: bug#33207: 26.1; Incorrect display of braille unicode
Date: Tue, 30 Oct 2018 20:54:31 -0400

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

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

>> The problem is that the braille unicode character BRAILLE PATTERN BLANK (0x2800) doesn't display as
>> blank but appears as what looks like a different character. I have submitted a question to stackoverflow which
>> includes screen shots of what the code should look like in both terminal and in emacs. I am running on
>> macOS Mojave 10.14.
>
> Probably macOS specific: that character displays fine on MS-Windows.

On my GNU/Linux box with both GTK and Lucid builds, I see that the
blanked dots do show up, similar to what the OP shows in their linked
screenshot.  Interestingly, I *don't* see the blanked dots in the
completion window for C-x 8 RET braille TAB.

[bug-33207-brail.png (image/png, attachment)]

[Message part 3 (text/plain, inline)]

Doing C-u C-x = on the character in the completion window shows (where
it's blanked out as expected)

    xft:-unknown-DejaVu Serif-normal-italic-normal-*-15-*-*-*-*-0-iso10646-1 (#xA6F)

whereas, the same character in other places shows (where it's not
entirely blanked out)

    xft:-unknown-Unifont-normal-normal-normal-*-15-*-*-*-d-0-iso10646-1 (#x2803)

Message #14 received at 33207 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: justinhj <at> gmail.com, 33207 <at> debbugs.gnu.org
Subject: Re: bug#33207: 26.1; Incorrect display of braille unicode
Date: Wed, 31 Oct 2018 18:09:39 +0200

> From: Noam Postavsky <npostavs <at> gmail.com>
> Cc: Justin Heyes-Jones <justinhj <at> gmail.com>,  33207 <at> debbugs.gnu.org
> Date: Tue, 30 Oct 2018 20:54:31 -0400
> 
> > Probably macOS specific: that character displays fine on MS-Windows.
> 
> On my GNU/Linux box with both GTK and Lucid builds, I see that the
> blanked dots do show up, similar to what the OP shows in their linked
> screenshot.  Interestingly, I *don't* see the blanked dots in the
> completion window for C-x 8 RET braille TAB.

Indeed, with Unifont I see it here also.  I found one or two other
fonts that have the same effect, but most of them display this
character as blank.

So if a different font works for the OP as well, I think we can
conclude that this is a font issue, not an Emacs bug.

Message #21 received at 33207-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Justin Heyes-Jones <justinhj <at> gmail.com>
Cc: 33207-done <at> debbugs.gnu.org
Subject: Re: bug#33207: 26.1; Incorrect display of braille unicode
Date: Sun, 04 Nov 2018 14:49:04 +0200

tags 33207 notabug
thanks

> From: Justin Heyes-Jones <justinhj <at> gmail.com>
> Date: Sat, 3 Nov 2018 21:36:31 -0700
> 
> On Wed, 31 Oct 2018 at 09:10, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
>  > From: Noam Postavsky <npostavs <at> gmail.com>
>  > Cc: Justin Heyes-Jones <justinhj <at> gmail.com>,  33207 <at> debbugs.gnu.org
>  > Date: Tue, 30 Oct 2018 20:54:31 -0400
>  > 
>  > > Probably macOS specific: that character displays fine on MS-Windows.
>  > 
>  > On my GNU/Linux box with both GTK and Lucid builds, I see that the
>  > blanked dots do show up, similar to what the OP shows in their linked
>  > screenshot.  Interestingly, I *don't* see the blanked dots in the
>  > completion window for C-x 8 RET braille TAB.
> 
>  Indeed, with Unifont I see it here also.  I found one or two other
>  fonts that have the same effect, but most of them display this
>  character as blank.
> 
>  So if a different font works for the OP as well, I think we can
>  conclude that this is a font issue, not an Emacs bug.
> 
> Thanks for looking into this. I wasn't able to get any of the fonts provided with macOS to display the BRAILLE
> characters correctly, but when I downloaded some additional fonts with better unicode support, the characters
> displayed correctly. So I think you're correct, this is not an Emacs bug.

Thanks, so I'm closing the bug.

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