GNU bug report logs - #73607
30.0.90; Strange behaviour of C-x with define-prefix-command

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

From: Sean Whitton <spwhitton <at> spwhitton.name>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.90; Strange behaviour of C-x with define-prefix-command
Date: Thu, 03 Oct 2024 10:42:05 +0800

1. emacs -q
2. (global-set-key "\C-z" (define-prefix-command 'foo))
3. C-z C-c => "C-z C-c is undefined" as expected

However:

4. C-z C-x => "C-z C-x- (C-h for help)"
5. C-z C-x C-h => "No commands with a binding that start with C-z C-x."

I am on the pgtk build.

-- 
Sean Whitton

Message #8 received at 73607 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Sean Whitton <spwhitton <at> spwhitton.name>
Cc: 73607 <at> debbugs.gnu.org
Subject: Re: bug#73607: 30.0.90;
 Strange behaviour of C-x with define-prefix-command
Date: Thu, 03 Oct 2024 10:05:56 +0300

> From: Sean Whitton <spwhitton <at> spwhitton.name>
> Date: Thu, 03 Oct 2024 10:42:05 +0800
> 
> 1. emacs -q
> 2. (global-set-key "\C-z" (define-prefix-command 'foo))
> 3. C-z C-c => "C-z C-c is undefined" as expected
> 
> However:
> 
> 4. C-z C-x => "C-z C-x- (C-h for help)"
> 5. C-z C-x C-h => "No commands with a binding that start with C-z C-x."

Why is that a problem?

Message #11 received at 73607 <at> debbugs.gnu.org (full text, mbox):

From: Sean Whitton <spwhitton <at> spwhitton.name>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 73607 <at> debbugs.gnu.org
Subject: Re: bug#73607: 30.0.90; Strange behaviour of C-x with
 define-prefix-command
Date: Thu, 03 Oct 2024 15:13:52 +0800

Hello,

On Thu 03 Oct 2024 at 10:05am +03, Eli Zaretskii wrote:

>> From: Sean Whitton <spwhitton <at> spwhitton.name>
>> Date: Thu, 03 Oct 2024 10:42:05 +0800
>>
>> 1. emacs -q
>> 2. (global-set-key "\C-z" (define-prefix-command 'foo))
>> 3. C-z C-c => "C-z C-c is undefined" as expected
>>
>> However:
>>
>> 4. C-z C-x => "C-z C-x- (C-h for help)"
>> 5. C-z C-x C-h => "No commands with a binding that start with C-z C-x."
>
> Why is that a problem?

It should say "C-z C-x is undefined" right away, like with every other key.

-- 
Sean Whitton

Message #14 received at 73607 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Sean Whitton <spwhitton <at> spwhitton.name>
Cc: 73607 <at> debbugs.gnu.org
Subject: Re: bug#73607: 30.0.90; Strange behaviour of C-x with
 define-prefix-command
Date: Thu, 03 Oct 2024 14:22:43 +0300

> From: Sean Whitton <spwhitton <at> spwhitton.name>
> Cc: 73607 <at> debbugs.gnu.org
> Date: Thu, 03 Oct 2024 15:13:52 +0800
> 
> Hello,
> 
> On Thu 03 Oct 2024 at 10:05am +03, Eli Zaretskii wrote:
> 
> >> From: Sean Whitton <spwhitton <at> spwhitton.name>
> >> Date: Thu, 03 Oct 2024 10:42:05 +0800
> >>
> >> 1. emacs -q
> >> 2. (global-set-key "\C-z" (define-prefix-command 'foo))
> >> 3. C-z C-c => "C-z C-c is undefined" as expected
> >>
> >> However:
> >>
> >> 4. C-z C-x => "C-z C-x- (C-h for help)"
> >> 5. C-z C-x C-h => "No commands with a binding that start with C-z C-x."
> >
> > Why is that a problem?
> 
> It should say "C-z C-x is undefined" right away, like with every other key.

C-x is not like other keys, it is handled specially.  I think.

Message #17 received at 73607 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 73607 <at> debbugs.gnu.org, Sean Whitton <spwhitton <at> spwhitton.name>
Subject: Re: bug#73607: 30.0.90; Strange behaviour of C-x with
 define-prefix-command
Date: Thu, 03 Oct 2024 13:58:36 +0200

On Okt 03 2024, Eli Zaretskii wrote:

>> >> 1. emacs -q
>> >> 2. (global-set-key "\C-z" (define-prefix-command 'foo))
>> >> 3. C-z C-c => "C-z C-c is undefined" as expected
>> >>
>> >> However:
>> >>
>> >> 4. C-z C-x => "C-z C-x- (C-h for help)"
>> >> 5. C-z C-x C-h => "No commands with a binding that start with C-z C-x."
>> >
>> > Why is that a problem?
>> 
>> It should say "C-z C-x is undefined" right away, like with every other key.
>
> C-x is not like other keys, it is handled specially.  I think.

C-x starts a key translation.  If you type C-z C-x 8 " s you get the
same binding as C-z ß.

-- 
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 #22 received at 73607-close <at> debbugs.gnu.org (full text, mbox):

From: Sean Whitton <spwhitton <at> spwhitton.name>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: 73607-close <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#73607: 30.0.90; Strange behaviour of C-x with
 define-prefix-command
Date: Fri, 04 Oct 2024 17:15:58 +0800

Hello,

On Thu 03 Oct 2024 at 01:58pm +02, Andreas Schwab wrote:

> C-x starts a key translation.  If you type C-z C-x 8 " s you get the
> same binding as C-z ß.

Ah, I see.  Thanks.  I think that this means this is not a bug.

-- 
Sean Whitton

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