GNU bug report logs - #33829
26.1; Unicode codepoint 177, PLUS-MINUS SIGN doesn't insert

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

From: Drew Adams <drew.adams <at> oracle.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1; Unicode codepoint 177, PLUS-MINUS SIGN doesn't insert
Date: Fri, 21 Dec 2018 08:50:51 -0800 (PST)

See https://emacs.stackexchange.com/q/46713/105

emacs -Q

(global-set-key (kbd "C-o") "±")

Then try `C-o'.  Instead of inserting the char you get `C-u 1-' in the
minibuffer.  Emacs seems to be interpreting `C-o' as a partial numeric
prefix arg.

But this works fine:

(global-set-key (kbd "C-o") "☬") to insert ☬.


In GNU Emacs 26.1 (build 1, x86_64-w64-mingw32)
 of 2018-05-30
Repository revision: 07f8f9bc5a51f5aa94eb099f3e15fbe0c20ea1ea
Windowing system distributor `Microsoft Corp.', version 10.0.16299
Configured using:
 `configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''

Message #8 received at 33829 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: 33829 <at> debbugs.gnu.org
Subject: Re: bug#33829: 26.1;
 Unicode codepoint 177, PLUS-MINUS SIGN doesn't insert
Date: Fri, 21 Dec 2018 18:28:00 +0100

On Dez 21 2018, Drew Adams <drew.adams <at> oracle.com> wrote:

> (global-set-key (kbd "C-o") "±")

ELISP> (key-description "±")
"M-1"

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Message #11 received at 33829 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: 33829 <at> debbugs.gnu.org
Subject: Re: bug#33829: 26.1;
 Unicode codepoint 177, PLUS-MINUS SIGN doesn't insert
Date: Fri, 21 Dec 2018 22:15:09 +0200

> Date: Fri, 21 Dec 2018 08:50:51 -0800 (PST)
> From: Drew Adams <drew.adams <at> oracle.com>
> 
> See https://emacs.stackexchange.com/q/46713/105
> 
> emacs -Q
> 
> (global-set-key (kbd "C-o") "±")
> 
> Then try `C-o'.  Instead of inserting the char you get `C-u 1-' in the
> minibuffer.  Emacs seems to be interpreting `C-o' as a partial numeric
> prefix arg.

No, it interprets ±, which is a single byte with the 8th bit set, as a
meta character.

(I wonder why you expected this to work even.)

> But this works fine:
> 
> (global-set-key (kbd "C-o") "☬") to insert ☬.

Because ☬ doesn't fit in a single byte.

Message #14 received at 33829 <at> debbugs.gnu.org (full text, mbox):

From: Drew Adams <drew.adams <at> oracle.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 33829 <at> debbugs.gnu.org
Subject: RE: bug#33829: 26.1; Unicode codepoint 177, PLUS-MINUS SIGN doesn't
 insert
Date: Fri, 21 Dec 2018 14:27:27 -0800 (PST)

> > (global-set-key (kbd "C-o") "±")
> > Then try `C-o'.  Instead of inserting the char you get `C-u 1-' in the
> > minibuffer.  Emacs seems to be interpreting `C-o' as a partial numeric
> > prefix arg.
> 
> No, it interprets ±, which is a single byte with the 8th bit set, as a
> meta character.
> (I wonder why you expected this to work even.)

Duh.  Wasn't thinking.  I'll close the bug.  Thx.

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