GNU bug report logs - #79792
31.0.50; elisp--company-doc-buffer replaces existing *Help* buffer

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Package: emacs; Reported by: Daniel Mendler <mail@HIDDEN>; dated Sat, 8 Nov 2025 19:43:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Juri Linkov <juri@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
 *Help* buffer
In-Reply-To: <86h5v24lgf.fsf@HIDDEN>
Organization: LINKOV.NET
References: <87v7jkgvlq.fsf@HIDDEN>
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Date: Mon, 10 Nov 2025 09:20:13 +0200
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>> >> >> >> We could add a new variable:
>> >> >> >>
>> >> >> >>   (defvar help-buffer-name "*Help*")
>> >> >> >>
>> >> >> >> Then it will be possible to let-bind it.
>> >> >> >
>> >> >> > Yes, this sounds like a good approach. Also if users want to open
>> >> >> > additional separate *Help* buffers by wrapping `describe-*' commands.
>> >> >> 
>> >> >> So here is the patch that should fix this problem:
>> >> >
>> >> > Is this really enough?  We have gobs of literal "*Help*" references in
>> >> > Lisp sources.
>> >> 
>> >> The remaining 100+ occurrences could be replaced later one by one
>> >> as the need arises.
>> >
>> > No, I think we should replace them together with this change.  A
>> > situation where some of Emacs use the variable, the rest use a literal
>> > string is not a good one: how can an arbitrary Lisp program know which
>> > one will be used?
>> >
>> > Are there any significant problems in replacing this all over?  (We
>> > should also announce this in NEWS, so that package authors know.)
>> 
>> Changing all matches blindly is a very dangerous change, because
>> many occurrences use this buffer name without loading help-mode.el.
>
> I didn't say "blindly".  And we could autoload the function if needed.

Not the function, but the variable.  But it's still a huge task
to replace all 100+ occurrences.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at 79792 <at> debbugs.gnu.org:


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From: Eli Zaretskii <eliz@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
In-Reply-To: <87h5v3f1p9.fsf@HIDDEN> (message from Juri Linkov on
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Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
 *Help* buffer
References: <87v7jkgvlq.fsf@HIDDEN>
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> From: Juri Linkov <juri@HIDDEN>
> Cc: mail@HIDDEN,  dmitry@HIDDEN,  79792 <at> debbugs.gnu.org
> Date: Sun, 09 Nov 2025 21:25:22 +0200
> 
> >> >> >> We could add a new variable:
> >> >> >>
> >> >> >>   (defvar help-buffer-name "*Help*")
> >> >> >>
> >> >> >> Then it will be possible to let-bind it.
> >> >> >
> >> >> > Yes, this sounds like a good approach. Also if users want to open
> >> >> > additional separate *Help* buffers by wrapping `describe-*' commands.
> >> >> 
> >> >> So here is the patch that should fix this problem:
> >> >
> >> > Is this really enough?  We have gobs of literal "*Help*" references in
> >> > Lisp sources.
> >> 
> >> The remaining 100+ occurrences could be replaced later one by one
> >> as the need arises.
> >
> > No, I think we should replace them together with this change.  A
> > situation where some of Emacs use the variable, the rest use a literal
> > string is not a good one: how can an arbitrary Lisp program know which
> > one will be used?
> >
> > Are there any significant problems in replacing this all over?  (We
> > should also announce this in NEWS, so that package authors know.)
> 
> Changing all matches blindly is a very dangerous change, because
> many occurrences use this buffer name without loading help-mode.el.

I didn't say "blindly".  And we could autoload the function if needed.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at 79792 <at> debbugs.gnu.org:


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From: Daniel Mendler <mail@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
 *Help* buffer
In-Reply-To: <87h5v3f1p9.fsf@HIDDEN>
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Juri Linkov <juri@HIDDEN> writes:

>>> >> >> We could add a new variable:
>>> >> >>
>>> >> >>   (defvar help-buffer-name "*Help*")
>>> >> >>
>>> >> >> Then it will be possible to let-bind it.
>>> >> >
>>> >> > Yes, this sounds like a good approach. Also if users want to open
>>> >> > additional separate *Help* buffers by wrapping `describe-*' commands.
>>> >> 
>>> >> So here is the patch that should fix this problem:
>>> >
>>> > Is this really enough?  We have gobs of literal "*Help*" references in
>>> > Lisp sources.
>>> 
>>> The remaining 100+ occurrences could be replaced later one by one
>>> as the need arises.
>>
>> No, I think we should replace them together with this change.  A
>> situation where some of Emacs use the variable, the rest use a literal
>> string is not a good one: how can an arbitrary Lisp program know which
>> one will be used?
>>
>> Are there any significant problems in replacing this all over?  (We
>> should also announce this in NEWS, so that package authors know.)
>
> Changing all matches blindly is a very dangerous change, because
> many occurrences use this buffer name without loading help-mode.el.

Could we preload help-buffer-name or add an autoload cookie?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at 79792 <at> debbugs.gnu.org:


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From: Juri Linkov <juri@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
 *Help* buffer
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 <87pl9r4t9n.fsf@HIDDEN> <874ir36509.fsf@HIDDEN>
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>> >> >> We could add a new variable:
>> >> >>
>> >> >>   (defvar help-buffer-name "*Help*")
>> >> >>
>> >> >> Then it will be possible to let-bind it.
>> >> >
>> >> > Yes, this sounds like a good approach. Also if users want to open
>> >> > additional separate *Help* buffers by wrapping `describe-*' commands.
>> >> 
>> >> So here is the patch that should fix this problem:
>> >
>> > Is this really enough?  We have gobs of literal "*Help*" references in
>> > Lisp sources.
>> 
>> The remaining 100+ occurrences could be replaced later one by one
>> as the need arises.
>
> No, I think we should replace them together with this change.  A
> situation where some of Emacs use the variable, the rest use a literal
> string is not a good one: how can an arbitrary Lisp program know which
> one will be used?
>
> Are there any significant problems in replacing this all over?  (We
> should also announce this in NEWS, so that package authors know.)

Changing all matches blindly is a very dangerous change, because
many occurrences use this buffer name without loading help-mode.el.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at 79792 <at> debbugs.gnu.org:


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Date: Sun, 09 Nov 2025 21:02:58 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
In-Reply-To: <878qgfghsf.fsf@HIDDEN> (message from Juri Linkov on
 Sun, 09 Nov 2025 20:52:32 +0200)
Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
 *Help* buffer
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> From: Juri Linkov <juri@HIDDEN>
> Cc: mail@HIDDEN,  dmitry@HIDDEN,  79792 <at> debbugs.gnu.org
> Date: Sun, 09 Nov 2025 20:52:32 +0200
> 
> >> >> We could add a new variable:
> >> >>
> >> >>   (defvar help-buffer-name "*Help*")
> >> >>
> >> >> Then it will be possible to let-bind it.
> >> >
> >> > Yes, this sounds like a good approach. Also if users want to open
> >> > additional separate *Help* buffers by wrapping `describe-*' commands.
> >> 
> >> So here is the patch that should fix this problem:
> >
> > Is this really enough?  We have gobs of literal "*Help*" references in
> > Lisp sources.
> 
> The remaining 100+ occurrences could be replaced later one by one
> as the need arises.

No, I think we should replace them together with this change.  A
situation where some of Emacs use the variable, the rest use a literal
string is not a good one: how can an arbitrary Lisp program know which
one will be used?

Are there any significant problems in replacing this all over?  (We
should also announce this in NEWS, so that package authors know.)
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at 79792 <at> debbugs.gnu.org:


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From: Juri Linkov <juri@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
 *Help* buffer
In-Reply-To: <86jyzz3v23.fsf@HIDDEN>
Organization: LINKOV.NET
References: <87v7jkgvlq.fsf@HIDDEN>
 <87pl9r4t9n.fsf@HIDDEN> <874ir36509.fsf@HIDDEN>
 <87ms4vgixp.fsf@HIDDEN> <86jyzz3v23.fsf@HIDDEN>
Date: Sun, 09 Nov 2025 20:52:32 +0200
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>> >> We could add a new variable:
>> >>
>> >>   (defvar help-buffer-name "*Help*")
>> >>
>> >> Then it will be possible to let-bind it.
>> >
>> > Yes, this sounds like a good approach. Also if users want to open
>> > additional separate *Help* buffers by wrapping `describe-*' commands.
>> 
>> So here is the patch that should fix this problem:
>
> Is this really enough?  We have gobs of literal "*Help*" references in
> Lisp sources.

The remaining 100+ occurrences could be replaced later one by one
as the need arises.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at 79792 <at> debbugs.gnu.org:


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From: Daniel Mendler <mail@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
 *Help* buffer
In-Reply-To: <86jyzz3v23.fsf@HIDDEN>
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Eli Zaretskii <eliz@HIDDEN> writes:

>> Cc: dmitry@HIDDEN, 79792 <at> debbugs.gnu.org
>> From: Juri Linkov <juri@HIDDEN>
>> Date: Sun, 09 Nov 2025 20:27:46 +0200
>> 
>> >> We could add a new variable:
>> >>
>> >>   (defvar help-buffer-name "*Help*")
>> >>
>> >> Then it will be possible to let-bind it.
>> >
>> > Yes, this sounds like a good approach. Also if users want to open
>> > additional separate *Help* buffers by wrapping `describe-*' commands.
>> 
>> So here is the patch that should fix this problem:
>
> Is this really enough?  We have gobs of literal "*Help*" references in
> Lisp sources.

For this particular bug this is enough as a fix. In addition, all
literal occurrences of "*Help*" in the source code be replaced
`help-buffer-name'.

Daniel
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at 79792 <at> debbugs.gnu.org:


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From: Eli Zaretskii <eliz@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
In-Reply-To: <87ms4vgixp.fsf@HIDDEN> (message from Juri Linkov on
 Sun, 09 Nov 2025 20:27:46 +0200)
Subject: Re: bug#79792: 31.0.50;
 elisp--company-doc-buffer replaces existing *Help* buffer
References: <87v7jkgvlq.fsf@HIDDEN>
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> Cc: dmitry@HIDDEN, 79792 <at> debbugs.gnu.org
> From: Juri Linkov <juri@HIDDEN>
> Date: Sun, 09 Nov 2025 20:27:46 +0200
> 
> >> We could add a new variable:
> >>
> >>   (defvar help-buffer-name "*Help*")
> >>
> >> Then it will be possible to let-bind it.
> >
> > Yes, this sounds like a good approach. Also if users want to open
> > additional separate *Help* buffers by wrapping `describe-*' commands.
> 
> So here is the patch that should fix this problem:

Is this really enough?  We have gobs of literal "*Help*" references in
Lisp sources.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at 79792 <at> debbugs.gnu.org:


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From: Juri Linkov <juri@HIDDEN>
To: Daniel Mendler <mail@HIDDEN>
Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
 *Help* buffer
In-Reply-To: <874ir36509.fsf@HIDDEN>
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--=-=-=
Content-Type: text/plain

>> We could add a new variable:
>>
>>   (defvar help-buffer-name "*Help*")
>>
>> Then it will be possible to let-bind it.
>
> Yes, this sounds like a good approach. Also if users want to open
> additional separate *Help* buffers by wrapping `describe-*' commands.

So here is the patch that should fix this problem:


--=-=-=
Content-Type: text/x-diff
Content-Disposition: inline; filename=help-buffer-name.patch

diff --git a/lisp/help-mode.el b/lisp/help-mode.el
index a8c0b1da818..8fe15ae5bac 100644
--- a/lisp/help-mode.el
+++ b/lisp/help-mode.el
@@ -519,6 +519,9 @@ help-setup-xref
 (defvar help-xref-following nil
   "Non-nil when following a help cross-reference.")
 
+(defvar help-buffer-name "*Help*"
+  "Name of the help buffer.")
+
 ;;;###autoload
 (defun help-buffer ()
   "Return the name of a buffer for inserting help.
@@ -531,7 +534,7 @@ help-buffer
    (if (and help-xref-following
             (derived-mode-p 'help-mode))
        (current-buffer)
-     (get-buffer-create "*Help*"))))
+     (get-buffer-create help-buffer-name))))
 
 (defvar describe-symbol-backends
   `((nil ,#'fboundp ,(lambda (s _b _f) (describe-function s)))
diff --git a/lisp/progmodes/elisp-mode.el b/lisp/progmodes/elisp-mode.el
index da8302953d1..5da410975b1 100644
--- a/lisp/progmodes/elisp-mode.el
+++ b/lisp/progmodes/elisp-mode.el
@@ -969,7 +969,8 @@ elisp--company-doc-buffer
       ;; Make sure we don't display it in another frame, otherwise
       ;; save-window-excursion won't be able to undo it.
       (let ((display-buffer-overriding-action
-             '(nil . ((inhibit-switch-frame . t)))))
+             '(nil . ((inhibit-switch-frame . t))))
+            (help-buffer-name " *elisp-doc-buffer*"))
         (ignore-errors
           (cond
            ((fboundp symbol) (describe-function symbol))

--=-=-=--
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at 79792 <at> debbugs.gnu.org:


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From: Daniel Mendler <mail@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
 *Help* buffer
In-Reply-To: <87pl9r4t9n.fsf@HIDDEN>
References: <87v7jkgvlq.fsf@HIDDEN> <87pl9r4t9n.fsf@HIDDEN>
Date: Sun, 09 Nov 2025 08:26:30 +0100
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Juri Linkov <juri@HIDDEN> writes:

>> A possible workaround is the following:
>>
>>     (advice-add #'elisp--company-doc-buffer
>>                 :around
>>                 (lambda (&rest app)
>>                   (cl-letf (((symbol-function #'help-buffer)
>>                              (lambda () (get-buffer-create " *elisp-doc-buffer*"))))
>>                     (apply app))))
>
> We could add a new variable:
>
>   (defvar help-buffer-name "*Help*")
>
> Then it will be possible to let-bind it.

Yes, this sounds like a good approach. Also if users want to open
additional separate *Help* buffers by wrapping `describe-*' commands.

Daniel
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Daniel Mendler <mail@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
 *Help* buffer
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Juri Linkov <juri@HIDDEN> writes:

>> A possible workaround is the following:
>>
>>     (advice-add #'elisp--company-doc-buffer
>>                 :around
>>                 (lambda (&rest app)
>>                   (cl-letf (((symbol-function #'help-buffer)
>>                              (lambda () (get-buffer-create " *elisp-doc-buffer*"))))
>>                     (apply app))))
>
> We could add a new variable:
>
>   (defvar help-buffer-name "*Help*")
>
> Then it will be possible to let-bind it.

Yes, this sounds like a good approach. Also if users want to open
additional separate *Help* buffers by wrapping `describe-*' commands.

Daniel
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
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> A possible workaround is the following:
>
>     (advice-add #'elisp--company-doc-buffer
>                 :around
>                 (lambda (&rest app)
>                   (cl-letf (((symbol-function #'help-buffer)
>                              (lambda () (get-buffer-create " *elisp-doc-buffer*"))))
>                     (apply app))))

We could add a new variable:

  (defvar help-buffer-name "*Help*")

Then it will be possible to let-bind it.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

Message received at 79792 <at> debbugs.gnu.org:


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Subject: Re: bug#79792: 31.0.50; elisp--company-doc-buffer replaces existing
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> A possible workaround is the following:
>
>     (advice-add #'elisp--company-doc-buffer
>                 :around
>                 (lambda (&rest app)
>                   (cl-letf (((symbol-function #'help-buffer)
>                              (lambda () (get-buffer-create " *elisp-doc-buffer*"))))
>                     (apply app))))

We could add a new variable:

  (defvar help-buffer-name "*Help*")

Then it will be possible to let-bind it.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.

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From: Daniel Mendler <mail@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 31.0.50; elisp--company-doc-buffer replaces existing *Help* buffer
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Date: Sat, 08 Nov 2025 20:41:53 +0100
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The function `elisp--company-doc-buffer' is provided by
`elisp-completion-at-point' as `:company-doc-buffer' metadata function.
The function looks up the documentation of a completion candidate and
returns the buffer with the documentation.

`elisp--company-doc-buffer' calls `describe-function',
`describe-variable' and similar functions to obtain the documentation.
The problem is that the *Help* buffer is reused for each of these calls.

If there is already a *Help* window open it will be replaced
unexpectedly if Corfu or Company requests completion candidate
documentation via the `:company-doc-buffer' function. This matters in
particular if the documentation is displayed in a popup
(`corfu-popupinfo-mode' or similar in Company).

A possible workaround is the following:

    (advice-add #'elisp--company-doc-buffer
                :around
                (lambda (&rest app)
                  (cl-letf (((symbol-function #'help-buffer)
                             (lambda () (get-buffer-create " *elisp-doc-buffer*"))))
                    (apply app))))

In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.49, cairo version 1.18.4) of 2025-11-08
Windowing system distributor 'The X.Org Foundation', version 11.0.12101016
System Description: Debian GNU/Linux 13 (trixie)

Configured using:
 'configure --prefix=$HOME/.local/share/emacs
 --without-compress-install --with-tree-sitter --with-native-compilation
 --with-dbus --without-selinux --without-threads --disable-gc-mark-trace
 --without-gsettings --without-gpm --with-cairo --with-cairo-xcb
 --with-xinput2 --with-x-toolkit=gtk3 --without-toolkit-scroll-bars
 'CFLAGS=-O3 -mtune=native -march=native''

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS HARFBUZZ JPEG LIBOTF LIBSYSTEMD
LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP
SOUND SQLITE3 TIFF TREE_SITTER WEBP X11 XDBE XIM XINERAMA XINPUT2 XPM
XRANDR GTK3 ZLIB
Acknowledgement sent to Daniel Mendler <mail@HIDDEN>:
New bug report received and forwarded. Copy sent to dmitry@HIDDEN, bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to dmitry@HIDDEN, bug-gnu-emacs@HIDDEN:
bug#79792; Package emacs. Full text available.
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