GNU bug report logs - #31588
26.1; format counts some Unicode characters as two

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

From: "James P. Ascher" <jpa4q <at> virginia.edu>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1; format counts some Unicode characters as two
Date: Thu, 24 May 2018 20:36:57 -0400

I've exhausted my ability to debug this one, having ended up in the
C source code, which is a bit beyond me.  I reproduced it with 'emacs
-Q' the following way:

1: Write a dozen x's, i.e. "xxxxxxxxxxxx" on *scratch*.
2: Move pointer to the middle of the line somewhere.
3: M-S-: and call (insert (format "%-2s" '➖))

What I expected:

xxxxx➖ xxxxxxxx

What results:

xxxxxx➖xxxxxxx


In comparison, (insert (format "%-2s" 'z)) gives:

xxxxxxz xxxxxx


And, (insert (format "%-3s" '➖z)) gives:

xxxxxx➖zxxxxxx


The same problem occurs on my setup with ❌ (CROSS MARK).

However, these Unicode items characters work as I expect: ▶ (BLACK
RIGHT-POINTING TRIANGLE), ✚ (HEAVY GREEK CROSS), ▷ (WHITE RIGHT-POINTING
TRIANGLE), and ◼ (BLACK MEDIUM SQUARE).

As far as I can tell, something is off about the styled_format and how
it counts characters- I suspect something about counting
multibyte characters, but it's a little beyond me.

I observed this bug while trying to fix a bug comes from the headers
display of the mu4e package where the overlays that show a deleted flag
are one character too narrow, which displays it incorrectly.


I'm happy to give more info or try other things.  Thanks for all your
hard work on Emacs and I hope this is helpful!

Respectfully submitted,
-James

***The below is NOT my Emacs -Q session, but I left it in case it's
   useful***


In GNU Emacs 26.1 (build 1, x86_64-apple-darwin17.5.0, NS appkit-1561.40 Version 10.13.4 (Build 17E202))
 of 2018-05-17 built on Grumpys-MacBook.local
Windowing system distributor 'Apple', version 10.3.1561
Recent messages:
find-function-C-source: The C source file editfns.c is not available
Note: file is write protected
Mark saved where search started
Quit
nil
Quit
Entering debugger...
Back to top level
Entering debugger...
Back to top level
nil [3 times]
Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/usr/local/share/emacs/site-lisp
 --infodir=/usr/local/Cellar/emacs/26.1-rc1/share/info/emacs
 --prefix=/usr/local/Cellar/emacs/26.1-rc1 --without-x --with-xml2
 --without-dbus --with-gnutls --with-imagemagick --with-rsvg
 --without-pop --with-ns --disable-ns-self-contained'

Configured features:
JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS THREADS LCMS2

Important settings:
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  locale-coding-system: utf-8-unix

Major mode: C/*l

Minor modes in effect:
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/Users/james/.emacs.d/elpa/org-20171225/ob-hledger hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/ob-hledger
/Users/james/.emacs.d/elpa/org-20171225/ob-maxima hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/ob-maxima
/Users/james/.emacs.d/elpa/org-20171225/org hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/org
/Users/james/.emacs.d/elpa/org-20171225/org-macro hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/org-macro
/Users/james/.emacs.d/elpa/org-20171225/ob-sql hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/ob-sql
/Users/james/.emacs.d/elpa/org-20171225/org-attach hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/org-attach
/Users/james/.emacs.d/elpa/org-20171225/ob-processing hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/ob-processing
/Users/james/.emacs.d/elpa/org-20171225/ox-texinfo hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/ox-texinfo
/Users/james/.emacs.d/elpa/org-20171225/org-irc hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/org-irc
/Users/james/.emacs.d/elpa/org-20171225/org-crypt hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/org-crypt
/Users/james/.emacs.d/elpa/org-20171225/org-footnote hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/org-footnote
/Users/james/.emacs.d/elpa/org-20171225/org-install hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/org/org-install
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/Users/james/.emacs.d/elpa/seq-20151121.1017/seq hides /usr/local/Cellar/emacs/26.1-rc1/share/emacs/26.1/lisp/emacs-lisp/seq

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Memory information:
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 (miscs 40 1370 5657)
 (strings 32 182852 46734)
 (string-bytes 1 6300425)
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Message #8 received at 31588 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: "James P. Ascher" <jpa4q <at> virginia.edu>
Cc: 31588 <at> debbugs.gnu.org
Subject: Re: bug#31588: 26.1; format counts some Unicode characters as two
Date: Thu, 24 May 2018 20:50:45 -0400

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

"James P. Ascher" <jpa4q <at> virginia.edu> writes:

> 3: M-S-: and call (insert (format "%-2s" '➖))
>
> What I expected:
>
> xxxxx➖ xxxxxxxx
>
> What results:
>
> xxxxxx➖xxxxxxx
>
>
> In comparison, (insert (format "%-2s" 'z)) gives:
>
> xxxxxxz xxxxxx

> The same problem occurs on my setup with ❌ (CROSS MARK).
>
> However, these Unicode items characters work as I expect: ▶ (BLACK
> RIGHT-POINTING TRIANGLE), ✚ (HEAVY GREEK CROSS), ▷ (WHITE RIGHT-POINTING
> TRIANGLE), and ◼ (BLACK MEDIUM SQUARE).
>
> As far as I can tell, something is off about the styled_format and how
> it counts characters- I suspect something about counting
> multibyte characters, but it's a little beyond me.

I think it's intended, ➖ and ❌ are wide characters:

    (mapcar #'char-width '(?➖ ?❌ ?▶ ?✚ ?▷ ?◼))
    ;=> (2 2 1 1 1 1)

Although in my current font the width seems to be more like 1.8 or
something.

[wide-chars.png (image/png, attachment)]

Message #11 received at 31588 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 31588 <at> debbugs.gnu.org, jpa4q <at> virginia.edu
Subject: Re: bug#31588: 26.1; format counts some Unicode characters as two
Date: Fri, 25 May 2018 09:37:32 +0300

> From: Noam Postavsky <npostavs <at> gmail.com>
> Date: Thu, 24 May 2018 20:50:45 -0400
> Cc: 31588 <at> debbugs.gnu.org
> 
> > As far as I can tell, something is off about the styled_format and how
> > it counts characters- I suspect something about counting
> > multibyte characters, but it's a little beyond me.
> 
> I think it's intended, ➖ and ❌ are wide characters:
> 
>     (mapcar #'char-width '(?➖ ?❌ ?▶ ?✚ ?▷ ?◼))
>     ;=> (2 2 1 1 1 1)

Yes, that's the reason.

> Although in my current font the width seems to be more like 1.8 or
> something.

Unfortunately, the actual width depends on the font, and what's more,
sometimes varies significantly between different fonts.  Maybe we
should have a variant of char-width that actually looks at the font
(of course, such a variant will need a window or frame as one of its
arguments).

But with the current state of our support for wide characters, this is
not a bug.

Message #14 received at 31588 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 31588 <at> debbugs.gnu.org, jpa4q <at> virginia.edu
Subject: Re: bug#31588: 26.1; format counts some Unicode characters as two
Date: Sun, 03 Jun 2018 12:29:20 -0400

close 31588
quit

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

>> From: Noam Postavsky <npostavs <at> gmail.com>
>> Date: Thu, 24 May 2018 20:50:45 -0400
>> Cc: 31588 <at> debbugs.gnu.org
>> 
>> > As far as I can tell, something is off about the styled_format and how
>> > it counts characters- I suspect something about counting
>> > multibyte characters, but it's a little beyond me.
>> 
>> I think it's intended, ➖ and ❌ are wide characters:
>> 
>>     (mapcar #'char-width '(?➖ ?❌ ?▶ ?✚ ?▷ ?◼))
>>     ;=> (2 2 1 1 1 1)
>
> Yes, that's the reason.
>
>> Although in my current font the width seems to be more like 1.8 or
>> something.
>
> Unfortunately, the actual width depends on the font, and what's more,
> sometimes varies significantly between different fonts.  Maybe we
> should have a variant of char-width that actually looks at the font
> (of course, such a variant will need a window or frame as one of its
> arguments).

Well, I don't know if format could do anything useful with a non-integer
width anyway.

> But with the current state of our support for wide characters, this is
> not a bug.

Okay, I'm closing this report.

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