GNU logs - #79960, boring messages

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Subject: bug#79960: 31.0.50; xterm-mouse-mode makes invisible child frames visible
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When `xterm-mouse-mode' is enabled after creating terminal child frames,
invisible child frames are made visible again.

1. Start emacs -Q -nw
2. Execute in the scratch buffer:

#+begin_src emacs-lisp
(package-initialize)
(global-corfu-mode) ;; Completion popup using TTY child frames
#+end_src

3. Trigger completion. For example type "(def" M-TAB in the scratch
buffer. The Corfu popup appears. Press C-g to close.

4. Enable `xterm-mouse-mode'. A Corfu child ghost frame appears.

In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.49, cairo version 1.18.4) of 2025-12-06
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:
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SOUND SQLITE3 TIFF TREE_SITTER WEBP X11 XDBE XIM XINERAMA XINPUT2 XPM
XRANDR GTK3 ZLIB

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To: Daniel Mendler <mail@HIDDEN>
Subject: bug#79960: Acknowledgement (31.0.50; xterm-mouse-mode makes
 invisible child frames visible)
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Subject: bug#79960: 31.0.50; xterm-mouse-mode makes invisible child frames visible
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From: Eli Zaretskii <eliz@HIDDEN>
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> Cc: martin rudalics <rudalics@HIDDEN>,
>  Gerd Möllmann <gerd.moellmann@HIDDEN>
> Date: Sun, 07 Dec 2025 19:04:28 +0100
> From:  Daniel Mendler via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> When `xterm-mouse-mode' is enabled after creating terminal child frames,
> invisible child frames are made visible again.
> 
> 1. Start emacs -Q -nw
> 2. Execute in the scratch buffer:
> 
> #+begin_src emacs-lisp
> (package-initialize)
> (global-corfu-mode) ;; Completion popup using TTY child frames
> #+end_src
> 
> 3. Trigger completion. For example type "(def" M-TAB in the scratch
> buffer. The Corfu popup appears. Press C-g to close.
> 
> 4. Enable `xterm-mouse-mode'. A Corfu child ghost frame appears.

Why do you call it a "ghost frame"?  Isn't it just one of the frames
on that terminal?

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Subject: bug#79960: 31.0.50; xterm-mouse-mode makes invisible child frames visible
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From: Daniel Mendler <mail@HIDDEN>
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Date: Sun, 07 Dec 2025 19:28:34 +0100
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Eli Zaretskii <eliz@HIDDEN> writes:

>> Cc: martin rudalics <rudalics@HIDDEN>,
>>  Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN>
>> Date: Sun, 07 Dec 2025 19:04:28 +0100
>> From:  Daniel Mendler via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>>=20
>> When `xterm-mouse-mode' is enabled after creating terminal child frames,
>> invisible child frames are made visible again.
>>=20
>> 1. Start emacs -Q -nw
>> 2. Execute in the scratch buffer:
>>=20
>> #+begin_src emacs-lisp
>> (package-initialize)
>> (global-corfu-mode) ;; Completion popup using TTY child frames
>> #+end_src
>>=20
>> 3. Trigger completion. For example type "(def" M-TAB in the scratch
>> buffer. The Corfu popup appears. Press C-g to close.
>>=20
>> 4. Enable `xterm-mouse-mode'. A Corfu child ghost frame appears.
>
> Why do you call it a "ghost frame"?  Isn't it just one of the frames
> on that terminal?

Sorry for being unclear with my language. I meant that the child frame
unintentionally reappears as a "ghost", at the same position where the
child frame has been, before it was made invisible. This means
`xterm-mouse-mode' somehow interferes with TTY child frame visibility.

Daniel

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Daniel Mendler <mail@HIDDEN> writes:

> When `xterm-mouse-mode' is enabled after creating terminal child frames,
> invisible child frames are made visible again.
>
> 1. Start emacs -Q -nw
> 2. Execute in the scratch buffer:
>
> #+begin_src emacs-lisp
> (package-initialize)
> (global-corfu-mode) ;; Completion popup using TTY child frames
> #+end_src
>
> 3. Trigger completion. For example type "(def" M-TAB in the scratch
> buffer. The Corfu popup appears. Press C-g to close.
>
> 4. Enable `xterm-mouse-mode'. A Corfu child ghost frame appears.
>
> In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
>  3.24.49, cairo version 1.18.4) of 2025-12-06
> 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

This looks suspicious:

xt-mouse.el:
  509 (defun turn-on-xterm-mouse-tracking-on-terminal (&optional terminal)
  510   "Enable xterm mouse tracking on TERMINAL."
  511   (when (and xterm-mouse-mode (eq t (terminal-live-p terminal))
  512              ;; Avoid the initial terminal which is not a termcap device.
  513              ;; FIXME: is there more elegant way to detect the initial
  514              ;; terminal?
  515              (not (string= (terminal-name terminal) "initial_terminal")))
  516     (unless (terminal-parameter terminal 'xterm-mouse-mode)
  517       ;; Simulate selecting a terminal by selecting one of its frames
  518       ;; so that we can set the terminal-local `input-decode-map'.
  519       (with-selected-frame (car (frames-on-display-list terminal))
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  520         (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
  521         (define-key input-decode-map "\e[<" 'xterm-mouse-translate-extended))

This should end up in select-frame -> do_switch_frame. And I'd bet the
car is the Corfu frame because new frames are pushed on the list.
Anyway, I'll try to reproduce this tomorrow, but if you feel like it,
you could try

1 file changed, 1 insertion(+), 1 deletion(-)
lisp/xt-mouse.el | 2 +-

modified   lisp/xt-mouse.el
@@ -516,7 +516,7 @@ turn-on-xterm-mouse-tracking-on-terminal
     (unless (terminal-parameter terminal 'xterm-mouse-mode)
       ;; Simulate selecting a terminal by selecting one of its frames
       ;; so that we can set the terminal-local `input-decode-map'.
-      (with-selected-frame (car (frames-on-display-list terminal))
+      (with-selected-frame (frame-root-frame (car (frames-on-display-list terminal)))
         (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
         (define-key input-decode-map "\e[<" 'xterm-mouse-translate-extended))
       (let ((enable (xterm-mouse-tracking-enable-sequence))

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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:

> This looks suspicious:
>
> xt-mouse.el:
>   509 (defun turn-on-xterm-mouse-tracking-on-terminal (&optional terminal)
>   510   "Enable xterm mouse tracking on TERMINAL."
>   511   (when (and xterm-mouse-mode (eq t (terminal-live-p terminal))
>   512              ;; Avoid the initial terminal which is not a termcap d=
evice.
>   513              ;; FIXME: is there more elegant way to detect the init=
ial
>   514              ;; terminal?
>   515              (not (string=3D (terminal-name terminal) "initial_term=
inal")))
>   516     (unless (terminal-parameter terminal 'xterm-mouse-mode)
>   517       ;; Simulate selecting a terminal by selecting one of its fram=
es
>   518       ;; so that we can set the terminal-local `input-decode-map'.
>   519       (with-selected-frame (car (frames-on-display-list terminal))
>               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   520         (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
>   521         (define-key input-decode-map "\e[<" 'xterm-mouse-translate-=
extended))
>
> This should end up in select-frame -> do_switch_frame. And I'd bet the
> car is the Corfu frame because new frames are pushed on the list.
> Anyway, I'll try to reproduce this tomorrow, but if you feel like it,
> you could try

Thanks. Yes, the first frame in the list is the Corfu frame (I added
names to the Corfu frames for ease of debugging.)

> 1 file changed, 1 insertion(+), 1 deletion(-)
> lisp/xt-mouse.el | 2 +-
>
> modified   lisp/xt-mouse.el
> @@ -516,7 +516,7 @@ turn-on-xterm-mouse-tracking-on-terminal
>      (unless (terminal-parameter terminal 'xterm-mouse-mode)
>        ;; Simulate selecting a terminal by selecting one of its frames
>        ;; so that we can set the terminal-local `input-decode-map'.
> -      (with-selected-frame (car (frames-on-display-list terminal))
> +      (with-selected-frame (frame-root-frame (car (frames-on-display-lis=
t terminal)))
>          (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
>          (define-key input-decode-map "\e[<" 'xterm-mouse-translate-exten=
ded))
>        (let ((enable (xterm-mouse-tracking-enable-sequence))

With this change The Corfu frame still reappears.

Daniel

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--=-=-=
Content-Type: text/plain

Daniel Mendler <mail@HIDDEN> writes:

>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> lisp/xt-mouse.el | 2 +-
>>
>> modified   lisp/xt-mouse.el
>> @@ -516,7 +516,7 @@ turn-on-xterm-mouse-tracking-on-terminal
>>      (unless (terminal-parameter terminal 'xterm-mouse-mode)
>>        ;; Simulate selecting a terminal by selecting one of its frames
>>        ;; so that we can set the terminal-local `input-decode-map'.
>> -      (with-selected-frame (car (frames-on-display-list terminal))
>> +      (with-selected-frame (frame-root-frame (car (frames-on-display-list terminal)))
>>          (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
>>          (define-key input-decode-map "\e[<" 'xterm-mouse-translate-extended))
>>        (let ((enable (xterm-mouse-tracking-enable-sequence))
>
> With this change The Corfu frame still reappears.

Thanks for checking.

I could reduce this to a simpler test case that does not involve Corfu.
With emacs -Q -nw -l run-emacs.el, where run-emacs.el is attached.

- C-l create child frame
- C-l make child frame invisible
- M-x xterm-mouse-mode RET disable mode 
- M-x xterm-mouse-mode RET enable mode

-> child frame is visible

I'll continue with this tomorrow.


--=-=-=
Content-Type: application/emacs-lisp
Content-Disposition: attachment; filename=run-emacs.el
Content-Transfer-Encoding: quoted-printable

;;; -*- lexical-binding: t -*-

(defvar root-frame (selected-frame))
(defvar tty-1 nil)

(defun tty-1 ()
  (interactive)
  (setq tty-1
	(make-frame
	 `((parent-frame . ,root-frame)
	   (left . 60) (top . 10)
	   (width . 15) (height . 10)
	   (tool-bar-lines . 0)
	   (menu-bar-lines . 0)
	   (minibuffer . nil)
	   (drag-internal-border . t)
	   (drag-with-header-line . t)
	   (drag-with-mode-line . t)
	   (internal-border-width . 2)
	   (border-width . 0)
	   (background-color . "yellow"))))
  (let ((window (frame-root-window tty-1)))
    (set-window-parameter
     window 'header-line-format '(" " (:eval (buffer-name)))))
  (select-frame-set-input-focus tty-1))

(defun tty-toggle-1 ()
  (interactive)
  (if (frame-live-p tty-1)
      (if (frame-visible-p tty-1)
	  (make-frame-invisible tty-1)
	(make-frame-visible tty-1))
    (tty-1)))

(global-set-key [(control l)] 'tty-toggle-1)

--=-=-=--

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From: Gerd =?UTF-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
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Date: Mon, 08 Dec 2025 06:35:23 +0100
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:

> Daniel Mendler <mail@HIDDEN> writes:
>
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>> lisp/xt-mouse.el | 2 +-
>>>
>>> modified   lisp/xt-mouse.el
>>> @@ -516,7 +516,7 @@ turn-on-xterm-mouse-tracking-on-terminal
>>>      (unless (terminal-parameter terminal 'xterm-mouse-mode)
>>>        ;; Simulate selecting a terminal by selecting one of its frames
>>>        ;; so that we can set the terminal-local `input-decode-map'.
>>> -      (with-selected-frame (car (frames-on-display-list terminal))
>>> +      (with-selected-frame (frame-root-frame (car (frames-on-display-l=
ist terminal)))
>>>          (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
>>>          (define-key input-decode-map "\e[<" 'xterm-mouse-translate-ext=
ended))
>>>        (let ((enable (xterm-mouse-tracking-enable-sequence))
>>
>> With this change The Corfu frame still reappears.
>
> Thanks for checking.
>
> I could reduce this to a simpler test case that does not involve Corfu.
> With emacs -Q -nw -l run-emacs.el, where run-emacs.el is attached.
>
> - C-l create child frame
> - C-l make child frame invisible
> - M-x xterm-mouse-mode RET disable mode=20
> - M-x xterm-mouse-mode RET enable mode
>
> -> child frame is visible
>
> I'll continue with this tomorrow.

Or rather now, because of Deutsche Bahn :-/.

Anyway. Both my test case above without Corfu, and the Corfu case you
gave me are fixed for me in master with the change I posted already:

1 file changed, 1 insertion(+), 1 deletion(-)
lisp/xt-mouse.el | 2 +-

modified   lisp/xt-mouse.el
@@ -515,7 +515,7 @@ turn-on-xterm-mouse-tracking-on-terminal
     (unless (terminal-parameter terminal 'xterm-mouse-mode)
       ;; Simulate selecting a terminal by selecting one of its frames
       ;; so that we can set the terminal-local `input-decode-map'.
-      (with-selected-frame (car (frames-on-display-list terminal))
+      (with-selected-frame (frame-root-frame (car (frames-on-display-list =
terminal)))
         (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
         (define-key input-decode-map "\e[<" 'xterm-mouse-translate-extende=
d))
       (let ((enable (xterm-mouse-tracking-enable-sequence))

The select-frame calls do_switch_frame with the child frame and that
makes the frame visible here

frame.c:
 1942       else
 1943         {
 1944         /* Should be covered by the condition above.  */
 1945           if (!FRAME_PARENT_FRAME (f))
 1946             fprintf (stderr, "do_switch_frame: 2 make child visible (=
%d)\n", f->visible);
 1947           SET_FRAME_VISIBLE (f, true);
 1948         }

as I suspected.

For the Corfu test, I made me a new init directory in which I installed
only Corfu via package-install. Then

- emacs -nw --init-directory DIR
- M-x global-corfu-mode
- in scratch, type frame- M-TAB to pop up Corfu
- 2 times M-x xterm-mouse-mode to disable and enable again

This makes the Corfu frame visible without the patch above, and doesn't
with my change.

Could you please re-check? If it still doesn't work for you, I guess I
need more detailed instructions how I can provoke that.

Message sent to bug-gnu-emacs@HIDDEN:

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Subject: bug#79960: 31.0.50; xterm-mouse-mode makes invisible child frames visible
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Thanks, Gerd=2E

I'll check again=2E

Daniel

Am 8=2E Dezember 2025 06:35:23 MEZ schrieb "Gerd M=C3=B6llmann" <gerd=2Emo=
ellmann@gmail=2Ecom>:
>Gerd M=C3=B6llmann <gerd=2Emoellmann@gmail=2Ecom> writes:
>
>> Daniel Mendler <mail@daniel-mendler=2Ede> writes:
>>
>>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>> lisp/xt-mouse=2Eel | 2 +-
>>>>
>>>> modified   lisp/xt-mouse=2Eel
>>>> @@ -516,7 +516,7 @@ turn-on-xterm-mouse-tracking-on-terminal
>>>>      (unless (terminal-parameter terminal 'xterm-mouse-mode)
>>>>        ;; Simulate selecting a terminal by selecting one of its frame=
s
>>>>        ;; so that we can set the terminal-local `input-decode-map'=2E
>>>> -      (with-selected-frame (car (frames-on-display-list terminal))
>>>> +      (with-selected-frame (frame-root-frame (car (frames-on-display=
-list terminal)))
>>>>          (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
>>>>          (define-key input-decode-map "\e[<" 'xterm-mouse-translate-e=
xtended))
>>>>        (let ((enable (xterm-mouse-tracking-enable-sequence))
>>>
>>> With this change The Corfu frame still reappears=2E
>>
>> Thanks for checking=2E
>>
>> I could reduce this to a simpler test case that does not involve Corfu=
=2E
>> With emacs -Q -nw -l run-emacs=2Eel, where run-emacs=2Eel is attached=
=2E
>>
>> - C-l create child frame
>> - C-l make child frame invisible
>> - M-x xterm-mouse-mode RET disable mode=20
>> - M-x xterm-mouse-mode RET enable mode
>>
>> -> child frame is visible
>>
>> I'll continue with this tomorrow=2E
>
>Or rather now, because of Deutsche Bahn :-/=2E
>
>Anyway=2E Both my test case above without Corfu, and the Corfu case you
>gave me are fixed for me in master with the change I posted already:
>
>1 file changed, 1 insertion(+), 1 deletion(-)
>lisp/xt-mouse=2Eel | 2 +-
>
>modified   lisp/xt-mouse=2Eel
>@@ -515,7 +515,7 @@ turn-on-xterm-mouse-tracking-on-terminal
>     (unless (terminal-parameter terminal 'xterm-mouse-mode)
>       ;; Simulate selecting a terminal by selecting one of its frames
>       ;; so that we can set the terminal-local `input-decode-map'=2E
>-      (with-selected-frame (car (frames-on-display-list terminal))
>+      (with-selected-frame (frame-root-frame (car (frames-on-display-lis=
t terminal)))
>         (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
>         (define-key input-decode-map "\e[<" 'xterm-mouse-translate-exten=
ded))
>       (let ((enable (xterm-mouse-tracking-enable-sequence))
>
>The select-frame calls do_switch_frame with the child frame and that
>makes the frame visible here
>
>frame=2Ec:
> 1942       else
> 1943         {
> 1944         /* Should be covered by the condition above=2E  */
> 1945           if (!FRAME_PARENT_FRAME (f))
> 1946             fprintf (stderr, "do_switch_frame: 2 make child visible=
 (%d)\n", f->visible);
> 1947           SET_FRAME_VISIBLE (f, true);
> 1948         }
>
>as I suspected=2E
>
>For the Corfu test, I made me a new init directory in which I installed
>only Corfu via package-install=2E Then
>
>- emacs -nw --init-directory DIR
>- M-x global-corfu-mode
>- in scratch, type frame- M-TAB to pop up Corfu
>- 2 times M-x xterm-mouse-mode to disable and enable again
>
>This makes the Corfu frame visible without the patch above, and doesn't
>with my change=2E
>
>Could you please re-check? If it still doesn't work for you, I guess I
>need more detailed instructions how I can provoke that=2E

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 > - C-l create child frame
 > - C-l make child frame invisible
 > - M-x xterm-mouse-mode RET disable mode
 > - M-x xterm-mouse-mode RET enable mode
 >
 > -> child frame is visible

I know we're doing that ever since.  But why should

(let ((frame (make-frame)))
   (make-frame-invisible frame)
   (select-window (frame-root-window frame))
   (set-window-buffer (selected-window) "*Messages*"))

get me a frame that shows *scratch* on a GUI and one that shows
*Messages* on a tty?

martin

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martin rudalics <rudalics@HIDDEN> writes:

>> - C-l create child frame
>> - C-l make child frame invisible
>> - M-x xterm-mouse-mode RET disable mode
>> - M-x xterm-mouse-mode RET enable mode
>>
>> -> child frame is visible
>
> I know we're doing that ever since.  But why should
>
> (let ((frame (make-frame)))
>   (make-frame-invisible frame)
>   (select-window (frame-root-window frame))
>   (set-window-buffer (selected-window) "*Messages*"))
>
> get me a frame that shows *scratch* on a GUI and one that shows
> *Messages* on a tty?
>
> martin

Strange.

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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:

> martin rudalics <rudalics@HIDDEN> writes:
>
>>> - C-l create child frame
>>> - C-l make child frame invisible
>>> - M-x xterm-mouse-mode RET disable mode
>>> - M-x xterm-mouse-mode RET enable mode
>>>
>>> -> child frame is visible
>>
>> I know we're doing that ever since.  But why should
>>
>> (let ((frame (make-frame)))
>>   (make-frame-invisible frame)
>>   (select-window (frame-root-window frame))
>>   (set-window-buffer (selected-window) "*Messages*"))
>>
>> get me a frame that shows *scratch* on a GUI and one that shows
>> *Messages* on a tty?
>>
>> martin
>
> Strange.

Could this be because GUIs have some windows that the tty doesn't have?
I don't remember the details, but I think there was some stuff in
dispnew.c where things could be a window in one case, and not in the
other case.

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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:

> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>
>> martin rudalics <rudalics@HIDDEN> writes:
>>
>>>> - C-l create child frame
>>>> - C-l make child frame invisible
>>>> - M-x xterm-mouse-mode RET disable mode
>>>> - M-x xterm-mouse-mode RET enable mode
>>>>
>>>> -> child frame is visible
>>>
>>> I know we're doing that ever since.  But why should
>>>
>>> (let ((frame (make-frame)))
>>>   (make-frame-invisible frame)
>>>   (select-window (frame-root-window frame))
>>>   (set-window-buffer (selected-window) "*Messages*"))
>>>
>>> get me a frame that shows *scratch* on a GUI and one that shows
>>> *Messages* on a tty?
>>>
>>> martin
>>
>> Strange.
>
> Could this be because GUIs have some windows that the tty doesn't have?
> I don't remember the details, but I think there was some stuff in
> dispnew.c where things could be a window in one case, and not in the
> other case.

This stuff

frame.h:
  246 #if defined HAVE_WINDOW_SYSTEM && !defined HAVE_EXT_MENU_BAR
  247   /* A dummy window used to display menu bars under X when no X
  248      toolkit support is available.  */
  249   Lisp_Object menu_bar_window;
  250 #endif
  251=20
  252 #if defined (HAVE_WINDOW_SYSTEM)
  253   /* A window used to display the tab-bar of a frame.  */
  254   Lisp_Object tab_bar_window;
  255=20
  256   /* Desired and current contents displayed in that window.  */
  257   Lisp_Object desired_tab_bar_string;
  258   Lisp_Object current_tab_bar_string;
  259 #endif
  260=20
  261 #if defined (HAVE_WINDOW_SYSTEM) && ! defined (HAVE_EXT_TOOL_BAR)
  262   /* A window used to display the tool-bar of a frame.  */
  263   Lisp_Object tool_bar_window;
  264=20
  265   /* Desired and current contents displayed in that window.  */
  266   Lisp_Object desired_tool_bar_string;
  267   Lisp_Object current_tool_bar_string;
  268 #endif

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 > Could this be because GUIs have some windows that the tty doesn't have?
 > I don't remember the details, but I think there was some stuff in
 > dispnew.c where things could be a window in one case, and not in the
 > other case.

It's because ever since do_switch_frame makes a tty frame visible and
leaves a GUI frame invisible.  I'd like to know the reason for the
special behavior on ttys.

martin

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martin rudalics <rudalics@HIDDEN> writes:

>> Could this be because GUIs have some windows that the tty doesn't have?
>> I don't remember the details, but I think there was some stuff in
>> dispnew.c where things could be a window in one case, and not in the
>> other case.
>
> It's because ever since do_switch_frame makes a tty frame visible and
> leaves a GUI frame invisible.  I'd like to know the reason for the
> special behavior on ttys.

I'm afraid I don't remember the details anymore. Some part of the
transition from having no child windows + the tri-state visibility
to having child windows ond boolean visibility.

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martin rudalics <rudalics@HIDDEN> writes:

>> I'm afraid I don't remember the details anymore. Some part of the
>> transition from having no child windows + the tri-state visibility
>> to having child windows ond boolean visibility.
>
> I meant why we make a normal tty frame visible when selecting it.  IIUC
> it's from

I assumed I was the culprit, sorry. Could have been, though :-).

>
> commit 9628b8878f46b2b7eeeb4f272d20f2e64de19f4a
> Author: K=C3=A1roly L=C5=91rentey <lorentey@HIDDEN>
> Date:   Fri Dec 26 04:24:54 2003 +0000
>
>     (do_switch_frame): Handle terminal frame visibility.

Wow, that's multi-tty, as early as 2003. Didn't know it's that old. I
must have already been gone then, so zero memories. And no chance to
understand what that does why.

> and the current version is from
>
> commit edfa7fa092c303265edeb2a0b530463cdfe63ab7
> Author: Dmitry Antipov <dmantipov@HIDDEN>
> Date:   Thu Jan 24 09:41:28 2013 +0400
>
>     Drop async_visible and async_iconified fields of struct frame.
>
> I nowhere see a motivation for the behavior yet we probably have to live
> with it.
>
> martin

Hm, one could of course just remove that making frames visible, and see
what happens. Could lead to a number of bugs, maybe, but OTOH, and at
least from my POV, it would be an improvement because it would remove 1
random mysteroious quirk.

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> Cc: Daniel Mendler <mail@HIDDEN>, 79960 <at> debbugs.gnu.org
> Date: Mon, 8 Dec 2025 10:45:44 +0100
> From:  martin rudalics via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
>  > Could this be because GUIs have some windows that the tty doesn't have?
>  > I don't remember the details, but I think there was some stuff in
>  > dispnew.c where things could be a window in one case, and not in the
>  > other case.
> 
> It's because ever since do_switch_frame makes a tty frame visible and
> leaves a GUI frame invisible.  I'd like to know the reason for the
> special behavior on ttys.

I'm not sure we should go in this direction to solve this issue.  IMO,
any code which uses with-selected-frame to select an arbitrary frame
should note whether that frame was invisible, and if so, make it
invisible again after it's done using the frame.  Because, even if the
change suggested by Gerd solves this particular scenario, we will next
see a bug report about a terminal that has _all_ of its frames
invisible.

(And that's after I wonder what is so important about a situation
where the user turns on xterm-mouse-mode so late into the session.)

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> Cc: Daniel Mendler <mail@HIDDEN>, 79960 <at> debbugs.gnu.org
> From: Gerd Möllmann <gerd.moellmann@HIDDEN>
> Date: Mon, 08 Dec 2025 12:05:30 +0100
> 
> martin rudalics <rudalics@HIDDEN> writes:
> 
> >> I'm afraid I don't remember the details anymore. Some part of the
> >> transition from having no child windows + the tri-state visibility
> >> to having child windows ond boolean visibility.
> >
> > I meant why we make a normal tty frame visible when selecting it.  IIUC
> > it's from
> 
> I assumed I was the culprit, sorry. Could have been, though :-).
> 
> >
> > commit 9628b8878f46b2b7eeeb4f272d20f2e64de19f4a
> > Author: Károly Lőrentey <lorentey@HIDDEN>
> > Date:   Fri Dec 26 04:24:54 2003 +0000
> >
> >     (do_switch_frame): Handle terminal frame visibility.
> 
> Wow, that's multi-tty, as early as 2003. Didn't know it's that old. I
> must have already been gone then, so zero memories. And no chance to
> understand what that does why.
> 
> > and the current version is from
> >
> > commit edfa7fa092c303265edeb2a0b530463cdfe63ab7
> > Author: Dmitry Antipov <dmantipov@HIDDEN>
> > Date:   Thu Jan 24 09:41:28 2013 +0400
> >
> >     Drop async_visible and async_iconified fields of struct frame.
> >
> > I nowhere see a motivation for the behavior yet we probably have to live
> > with it.
> >
> > martin
> 
> Hm, one could of course just remove that making frames visible, and see
> what happens. Could lead to a number of bugs, maybe, but OTOH, and at
> least from my POV, it would be an improvement because it would remove 1
> random mysteroious quirk.

AFAIR, we already tried that, when you introduced child frames on
TTYs.  We went back because there were too many problems with that.

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 > I'm not sure we should go in this direction to solve this issue.  IMO,
 > any code which uses with-selected-frame to select an arbitrary frame
 > should note whether that frame was invisible, and if so, make it
 > invisible again after it's done using the frame.

I'm pretty sure that we cannot change anything here.  'select-frame' on
a tty can now be seen as a synonym for making the frame visible, raising
and selecting it.  Maybe we should explain that somewhere.

 > Because, even if the
 > change suggested by Gerd solves this particular scenario, we will next
 > see a bug report about a terminal that has _all_ of its frames
 > invisible.

Indeed.  The do_switch_frame call in delete_frame might depend on it.

martin

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> Date: Mon, 8 Dec 2025 15:23:28 +0100
> Cc: gerd.moellmann@HIDDEN, mail@HIDDEN, 79960 <at> debbugs.gnu.org
> From: martin rudalics <rudalics@HIDDEN>
> 
>  > I'm not sure we should go in this direction to solve this issue.  IMO,
>  > any code which uses with-selected-frame to select an arbitrary frame
>  > should note whether that frame was invisible, and if so, make it
>  > invisible again after it's done using the frame.
> 
> I'm pretty sure that we cannot change anything here.  'select-frame' on
> a tty can now be seen as a synonym for making the frame visible, raising
> and selecting it.  Maybe we should explain that somewhere.

What I meant was that in this code from xt-mouse.el:

      ;; Simulate selecting a terminal by selecting one of its frames
      ;; so that we can set the terminal-local `input-decode-map'.
      (with-selected-frame (car (frames-on-display-list terminal))
        (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
        (define-key input-decode-map "\e[<" 'xterm-mouse-translate-extended))

we should make the frame we select invisible again if it was invisible
before we selected it.  IOW, select-frame should not change how it
works, but we should augment the code below to keep the frame
invisible.  After all, we just picked up one frame to "simulate
selecting a terminal", we don't really care what that frame is and how
it is used.

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 > What I meant was that in this code from xt-mouse.el:
 >
 >        ;; Simulate selecting a terminal by selecting one of its frames
 >        ;; so that we can set the terminal-local `input-decode-map'.
 >        (with-selected-frame (car (frames-on-display-list terminal))
 >          (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
 >          (define-key input-decode-map "\e[<" 'xterm-mouse-translate-extended))
 >
 > we should make the frame we select invisible again if it was invisible
 > before we selected it.  IOW, select-frame should not change how it
 > works, but we should augment the code below to keep the frame
 > invisible.  After all, we just picked up one frame to "simulate
 > selecting a terminal", we don't really care what that frame is and how
 > it is used.

Since on a tty there should be always at least one visible frame, we
could select a visible frame in the first place:

   (with-selected-frame (car (filtered-frame-list
			     (lambda (frame)
			       (and (eq (frame-terminal frame) terminal)
				    (frame-visible-p frame)))))

martin

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From: Gerd =?UTF-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
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martin rudalics <rudalics@HIDDEN> writes:

>> What I meant was that in this code from xt-mouse.el:
>>
>>        ;; Simulate selecting a terminal by selecting one of its frames
>>        ;; so that we can set the terminal-local `input-decode-map'.
>>        (with-selected-frame (car (frames-on-display-list terminal))
>>          (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
>>          (define-key input-decode-map "\e[<" 'xterm-mouse-translate-extended))
>>
>> we should make the frame we select invisible again if it was invisible
>> before we selected it.  IOW, select-frame should not change how it
>> works, but we should augment the code below to keep the frame
>> invisible.  After all, we just picked up one frame to "simulate
>> selecting a terminal", we don't really care what that frame is and how
>> it is used.
>
> Since on a tty there should be always at least one visible frame, we
> could select a visible frame in the first place:
>
>   (with-selected-frame (car (filtered-frame-list
> 			     (lambda (frame)
> 			       (and (eq (frame-terminal frame) terminal)
> 				    (frame-visible-p frame)))))
>
> martin

Hm. Aren't all child frames of an invisible root frame invisible?

How about, for this case, a function terminal-local-value analogous to
buffer-local-value? Iff Daniel confirms that this is the problem, which
he hasn't yet, and iff we want to fix this at all, given that
xterm-mouse-mode is on by default, and so on.

Message sent to bug-gnu-emacs@HIDDEN:

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> Date: Mon, 8 Dec 2025 17:03:46 +0100
> Cc: gerd.moellmann@HIDDEN, mail@HIDDEN, 79960 <at> debbugs.gnu.org
> From: martin rudalics <rudalics@HIDDEN>
> 
>  > What I meant was that in this code from xt-mouse.el:
>  >
>  >        ;; Simulate selecting a terminal by selecting one of its frames
>  >        ;; so that we can set the terminal-local `input-decode-map'.
>  >        (with-selected-frame (car (frames-on-display-list terminal))
>  >          (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
>  >          (define-key input-decode-map "\e[<" 'xterm-mouse-translate-extended))
>  >
>  > we should make the frame we select invisible again if it was invisible
>  > before we selected it.  IOW, select-frame should not change how it
>  > works, but we should augment the code below to keep the frame
>  > invisible.  After all, we just picked up one frame to "simulate
>  > selecting a terminal", we don't really care what that frame is and how
>  > it is used.
> 
> Since on a tty there should be always at least one visible frame, we
> could select a visible frame in the first place:
> 
>    (with-selected-frame (car (filtered-frame-list
> 			     (lambda (frame)
> 			       (and (eq (frame-terminal frame) terminal)
> 				    (frame-visible-p frame)))))

Didn't you just say that all TTY frames are "visible"?

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 > Hm. Aren't all child frames of an invisible root frame invisible?

Hopefully.  But on a tty there must be always at least one visible
frame.  On a GUI Emacs can make all frames invisible with the FORCE
argument.

martin

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 >> Since on a tty there should be always at least one visible frame, we
 >> could select a visible frame in the first place:
 >>
 >>     (with-selected-frame (car (filtered-frame-list
 >> 			     (lambda (frame)
 >> 			       (and (eq (frame-terminal frame) terminal)
 >> 				    (frame-visible-p frame)))))
 >
 > Didn't you just say that all TTY frames are "visible"?

No.  But IIRC this was the case before Gerd implemented child frames.

martin

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martin rudalics <rudalics@HIDDEN> writes:

>> Hm. Aren't all child frames of an invisible root frame invisible?
>
> Hopefully.  But on a tty there must be always at least one visible
> frame.  On a GUI Emacs can make all frames invisible with the FORCE
> argument.
>

Duh, right. Exactly one of the root frames of a terminal should always
be visible.

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> Date: Mon, 8 Dec 2025 18:03:45 +0100
> Cc: gerd.moellmann@HIDDEN, mail@HIDDEN, 79960 <at> debbugs.gnu.org
> From: martin rudalics <rudalics@HIDDEN>
> 
>  >> Since on a tty there should be always at least one visible frame, we
>  >> could select a visible frame in the first place:
>  >>
>  >>     (with-selected-frame (car (filtered-frame-list
>  >> 			     (lambda (frame)
>  >> 			       (and (eq (frame-terminal frame) terminal)
>  >> 				    (frame-visible-p frame)))))
>  >
>  > Didn't you just say that all TTY frames are "visible"?
> 
> No.  But IIRC this was the case before Gerd implemented child frames.

Then why not simply use tty-top-frame?

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Eli Zaretskii <eliz@HIDDEN> writes:

>> Date: Mon, 8 Dec 2025 18:03:45 +0100
>> Cc: gerd.moellmann@HIDDEN, mail@HIDDEN, 79960 <at> debbugs.gnu.org
>> From: martin rudalics <rudalics@HIDDEN>
>> 
>>  >> Since on a tty there should be always at least one visible frame, we
>>  >> could select a visible frame in the first place:
>>  >>
>>  >>     (with-selected-frame (car (filtered-frame-list
>>  >> 			     (lambda (frame)
>>  >> 			       (and (eq (frame-terminal frame) terminal)
>>  >> 				    (frame-visible-p frame)))))
>>  >
>>  > Didn't you just say that all TTY frames are "visible"?
>> 
>> No.  But IIRC this was the case before Gerd implemented child frames.
>
> Then why not simply use tty-top-frame?

Good idea.

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 > Then why not simply use tty-top-frame?

Yes.  This should work.

martin

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Subject: bug#79960: 31.0.50; xterm-mouse-mode makes invisible child frames visible
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From: Gerd =?UTF-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
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--=-=-=
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:

> Eli Zaretskii <eliz@HIDDEN> writes:
>
>>> Date: Mon, 8 Dec 2025 18:03:45 +0100
>>> Cc: gerd.moellmann@HIDDEN, mail@HIDDEN, 79960@HIDDEN=
.org
>>> From: martin rudalics <rudalics@HIDDEN>
>>>=20
>>>  >> Since on a tty there should be always at least one visible frame, we
>>>  >> could select a visible frame in the first place:
>>>  >>
>>>  >>     (with-selected-frame (car (filtered-frame-list
>>>  >> 			     (lambda (frame)
>>>  >> 			       (and (eq (frame-terminal frame) terminal)
>>>  >> 				    (frame-visible-p frame)))))
>>>  >
>>>  > Didn't you just say that all TTY frames are "visible"?
>>>=20
>>> No.  But IIRC this was the case before Gerd implemented child frames.
>>
>> Then why not simply use tty-top-frame?
>
> Good idea.=20

@Daniel could you please try this:


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Don-t-make-a-tty-child-frame-visible-by-selecting-it.patch

From acce55e66d5d13f374e504ddacd7aa70e2bfc671 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gerd=20M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
Date: Tue, 9 Dec 2025 02:52:57 +0100
Subject: [PATCH] Don't make a tty child frame visible by selecting it
 (bug#79960)

* lisp/xt-mouse.el (turn-on-xterm-mouse-tracking-on-terminal):
Use the tty-top-frame to avoid accidentally making an invisible
child frame visible by selecting it
---
 lisp/xt-mouse.el | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lisp/xt-mouse.el b/lisp/xt-mouse.el
index 414d824578c..b1d358f078b 100644
--- a/lisp/xt-mouse.el
+++ b/lisp/xt-mouse.el
@@ -516,7 +516,9 @@ turn-on-xterm-mouse-tracking-on-terminal
     (unless (terminal-parameter terminal 'xterm-mouse-mode)
       ;; Simulate selecting a terminal by selecting one of its frames
       ;; so that we can set the terminal-local `input-decode-map'.
-      (with-selected-frame (car (frames-on-display-list terminal))
+      ;; Use the tty-top-frame to avoid accidentally making an invisible
+      ;; child frame visible by selecting it (bug#79960).
+      (with-selected-frame (tty-top-frame terminal)
         (define-key input-decode-map "\e[M" 'xterm-mouse-translate)
         (define-key input-decode-map "\e[<" 'xterm-mouse-translate-extended))
       (let ((enable (xterm-mouse-tracking-enable-sequence))
-- 
2.52.0


--=-=-=--

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Subject: bug#79960: 31.0.50; xterm-mouse-mode makes invisible child frames visible
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:

> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>
>> Eli Zaretskii <eliz@HIDDEN> writes:
>>
>>>> Date: Mon, 8 Dec 2025 18:03:45 +0100
>>>> Cc: gerd.moellmann@HIDDEN, mail@HIDDEN, 79960@HIDDEN=
u.org
>>>> From: martin rudalics <rudalics@HIDDEN>
>>>>=20
>>>>  >> Since on a tty there should be always at least one visible frame, =
we
>>>>  >> could select a visible frame in the first place:
>>>>  >>
>>>>  >>     (with-selected-frame (car (filtered-frame-list
>>>>  >> 			     (lambda (frame)
>>>>  >> 			       (and (eq (frame-terminal frame) terminal)
>>>>  >> 				    (frame-visible-p frame)))))
>>>>  >
>>>>  > Didn't you just say that all TTY frames are "visible"?
>>>>=20
>>>> No.  But IIRC this was the case before Gerd implemented child frames.
>>>
>>> Then why not simply use tty-top-frame?
>>
>> Good idea.=20
>
> @Daniel could you please try this:

Thanks Gerd! This works.

Daniel

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From: Gerd =?UTF-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
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Daniel Mendler <mail@HIDDEN> writes:

> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>
>> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>>
>>> Eli Zaretskii <eliz@HIDDEN> writes:
>>>
>>>>> Date: Mon, 8 Dec 2025 18:03:45 +0100
>>>>> Cc: gerd.moellmann@HIDDEN, mail@HIDDEN, 79960@HIDDEN=
nu.org
>>>>> From: martin rudalics <rudalics@HIDDEN>
>>>>>=20
>>>>>  >> Since on a tty there should be always at least one visible frame,=
 we
>>>>>  >> could select a visible frame in the first place:
>>>>>  >>
>>>>>  >>     (with-selected-frame (car (filtered-frame-list
>>>>>  >> 			     (lambda (frame)
>>>>>  >> 			       (and (eq (frame-terminal frame) terminal)
>>>>>  >> 				    (frame-visible-p frame)))))
>>>>>  >
>>>>>  > Didn't you just say that all TTY frames are "visible"?
>>>>>=20
>>>>> No.  But IIRC this was the case before Gerd implemented child frames.
>>>>
>>>> Then why not simply use tty-top-frame?
>>>
>>> Good idea.=20
>>
>> @Daniel could you please try this:
>
> Thanks Gerd! This works.
>
> Daniel

Thanks for testing!

I've oushed that to master, and closing.

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close 79960 31.1
quit

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