GNU bug report logs - #79717
31.0.50; Setting ns-command-modifier breaks C-M-d on macOS

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Package: emacs; Reported by: Arash Esbati <arash@HIDDEN>; Keywords: notabug; Done: Arash Esbati <arash@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
bug closed, send any further explanations to 79717 <at> debbugs.gnu.org and Arash Esbati <arash@HIDDEN> Request was from Arash Esbati <arash@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Added tag(s) notabug. Request was from Arash Esbati <arash@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Arash Esbati <arash@HIDDEN>
To: Rudolf Schlatte <rudi@HIDDEN>
Subject: Re: bug#79717: 31.0.50; Setting ns-command-modifier breaks C-M-d on
 macOS
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tags 79717 notabug
close 79717
thanks

Rudolf Schlatte <rudi@HIDDEN> writes:

> Hmm, C-M-d rings a bell -- in MacOS programs, it summons a pop-up with
> the dictionary definition for the word under the cursor IIRC.  I can't
> test if that's stil true, since I applied the fix at
> https://stackoverflow.com/a/20692071 to turn that off.

Thanks, I briefly had a look at general macOS shortcuts, but obviously
missed this one and now had a closer look (under Text-editing
shortcuts[1]):

  Control-Command-D: Show or hide the definition of the selected word.

I'm not familiar enough with Emacs and macOS to say why C-M-d is
intercepted by the OS and other things like C-b not, so I take it for
granted and close this report.

Best, Arash

Footnotes:
[1]  https://support.apple.com/en-us/102650
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79717; Package emacs. Full text available.

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From: Rudolf Schlatte <rudi@HIDDEN>
Subject: Re: bug#79717: 31.0.50;
 Setting ns-command-modifier breaks C-M-d on macOS
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Arash Esbati <arash@HIDDEN> writes:

> Hi all,
>
> I start with 'emacs -Q' from a shell and hit 'C-h k C-M-d' and in the
> Help buffer, I see:
>
>   C-M-d runs the command down-list (found in global-map), which is an
>   interactive native-comp-function in ‘lisp.el’.
>
>   It is bound to C-M-<down>, C-M-d and ESC C-<down>.
>
>   (down-list &optional ARG INTERACTIVE)
>   ...
>
> C-M is in this case the Control-key and the Option-key on my keyboard.
>
> Now I eval:
>
>   (setq ns-command-modifier 'meta)
>
> and hit 'C-h k C-M-d' again (Control-key and Command-key), Emacs waits
> with "Describe the following key, mouse click or menu item: " in the
> minibuffer, and I see this in the shell where I started Emacs (line
> breaks added for legibility):
>
>   2025-10-29 11:58:18.545 emacs[16778:138670] Lookup: Unhandled exception
>   'NSInternalInconsistencyException' caught in
>   +[LULookupDefinitionModule _focusTermUsingQueue:handler:]
>
> C-d and M-d both work as expected, but C-M-d not.  C-M-f works as
> expected.

Hmm, C-M-d rings a bell -- in MacOS programs, it summons a pop-up with
the dictionary definition for the word under the cursor IIRC.  I can't
test if that's stil true, since I applied the fix at
https://stackoverflow.com/a/20692071 to turn that off.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79717; Package emacs. Full text available.

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From: Arash Esbati <arash@HIDDEN>
To: "emacs-bugs" <bug-gnu-emacs@HIDDEN>
Subject: 31.0.50; Setting ns-command-modifier breaks C-M-d on macOS
Date: Wed, 29 Oct 2025 12:09:49 +0100
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Hi all,

I start with 'emacs -Q' from a shell and hit 'C-h k C-M-d' and in the
Help buffer, I see:

  C-M-d runs the command down-list (found in global-map), which is an
  interactive native-comp-function in =E2=80=98lisp.el=E2=80=99.

  It is bound to C-M-<down>, C-M-d and ESC C-<down>.

  (down-list &optional ARG INTERACTIVE)
  ...

C-M is in this case the Control-key and the Option-key on my keyboard.

Now I eval:

  (setq ns-command-modifier 'meta)

and hit 'C-h k C-M-d' again (Control-key and Command-key), Emacs waits
with "Describe the following key, mouse click or menu item: " in the
minibuffer, and I see this in the shell where I started Emacs (line
breaks added for legibility):

  2025-10-29 11:58:18.545 emacs[16778:138670] Lookup: Unhandled exception
  'NSInternalInconsistencyException' caught in
  +[LULookupDefinitionModule _focusTermUsingQueue:handler:]

C-d and M-d both work as expected, but C-M-d not.  C-M-f works as
expected.

Best, Arash

In GNU Emacs 31.0.50 (build 2, aarch64-apple-darwin24.6.0, NS
 appkit-2575.70 Version 15.7.1 (Build 24G231)) of 2025-10-18
Repository revision: 48357dc612ffe2d6b286e3f99a0e7e9c80cfcbb8
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2575
System Description:  macOS 15.7.1

Configured using:
 'configure --with-ns --with-threads --with-modules
 --with-native-compilation --without-compress-install --without-harfbuzz
 --without-mailutils --without-pop 'CFLAGS=3D-O2 -g0 -pipe '
 'CPPFLAGS=3D-I/opt/homebrew/opt/gcc/include
 -I/opt/homebrew/opt/libgccjit/include -I/opt/homebrew/opt/gmp/include
 -I/opt/homebrew/opt/libxml2/include '
 'LDFLAGS=3D-L/opt/homebrew/opt/gcc/lib/gcc/current
 -L/opt/homebrew/opt/gmp/lib -L/opt/homebrew/opt/libxml2/lib ''
Acknowledgement sent to Arash Esbati <arash@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#79717; Package emacs. Full text available.
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