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bug#33207: 26.1; Incorrect display of braille unicode

From: Noam Postavsky
Subject: bug#33207: 26.1; Incorrect display of braille unicode
Date: Tue, 30 Oct 2018 20:54:31 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Eli Zaretskii <address@hidden> 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.

Attachment: bug-33207-brail.png
Description: screenshot of braille characters

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 

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)

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