GNU bug report logs - #49248
28.0.50; read-from-minibuffer returns a window-live-p error when its original window is deleted

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

From: Thierry Volpiatto <thievol <at> posteo.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; read-from-minibuffer returns a window-live-p error when
 its original window is deleted
Date: Mon, 28 Jun 2021 06:32:27 +0000

Hello, I have a bug report
https://github.com/emacs-helm/helm/issues/2424
where it seems a minibuffer not belong anymore to its window when this
one is deleted.
Here is what's happening:
I have a function that change the place of the window where originally
read-from-minibuffer was called, the window goes right, left, up and
down at each call of this function, but once we press RET to exit the
read-from-minibuffer an error is raised:

Wrong type argument: window-live-p, #<window 38>
(See backtrace in the link to helm issue mentionned above)

The error seems to come from read-from-minibuffer.

This always worked since emacs-24 to emacs-27.2.

Here is the function:

https://github.com/emacs-helm/helm/blob/master/helm.el#L6596

I wonder if this is a bug or an incompatible change in emacs-28, if so
what are the new directives in such case.

Thanks.


In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.10)
 of 2021-06-27 built on IPadS340
Repository revision: b8f9e58ef72402e69a1f0960816184d52e5d2d29
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Linux Mint 19.3

Configured using:
 'configure CFLAGS=-O8 --with-mailutils --with-cairo
 --with-native-compilation'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB

Important settings:
  value of $LANG: fr_FR.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Elisp

Minor modes in effect:
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  global-undo-tree-mode: t
  undo-tree-mode: t
  global-ligature-mode: t
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  psession-mode: t
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  helm-adaptive-mode: t
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  dired-async-mode: t
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Load-path shadows:
/home/thierry/.emacs.d/straight/build/transient/transient hides /usr/local/share/emacs/28.0.50/lisp/transient

Features:
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Memory information:
((conses 16 576183 177686)
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<#secure method=pgpmime mode=sign>

-- 
Thierry

Message #8 received at 49248 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Thierry Volpiatto <thievol <at> posteo.net>, 49248 <at> debbugs.gnu.org
Subject: Re: bug#49248: 28.0.50; read-from-minibuffer returns a window-live-p
 error when its original window is deleted
Date: Mon, 28 Jun 2021 09:53:22 +0200

[Message part 1 (text/plain, inline)]

> Wrong type argument: window-live-p, #<window 38>
> (See backtrace in the link to helm issue mentionned above)

Can you try the attached.

martin

[minibuf.c.diff (text/x-patch, attachment)]

Message #11 received at 49248 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: martin rudalics <rudalics <at> gmx.at>
Cc: 49248 <at> debbugs.gnu.org
Subject: Re: bug#49248: 28.0.50; read-from-minibuffer returns a
 window-live-p error when its original window is deleted
Date: Mon, 28 Jun 2021 11:47:22 +0000

[Message part 1 (text/plain, inline)]

martin rudalics <rudalics <at> gmx.at> writes:

>> Wrong type argument: window-live-p, #<window 38>
>> (See backtrace in the link to helm issue mentionned above)
>
> Can you try the attached.

Thanks Martin for quick answer and fix, yes it is now working.

-- 
Thierry

[signature.asc (application/pgp-signature, inline)]

Message #14 received at 49248 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 49248 <at> debbugs.gnu.org
Subject: Re: bug#49248: 28.0.50; read-from-minibuffer returns a window-live-p
 error when its original window is deleted
Date: Tue, 29 Jun 2021 10:03:11 +0200

> Thanks Martin for quick answer and fix, yes it is now working.

Pushed to master now.  Apparently, exiting from the minibuffer may
select a frame no less than four times here:

#1 in read_minibuf_unwind
  if (!EQ (exp_MB_frame, saved_selected_frame)
      && !NILP (exp_MB_frame))
    do_switch_frame (exp_MB_frame, 0, 0, Qt); /* This also sets
					     minibuf_window */

#2 in read_minibuf_unwind
      else if (WINDOW_LIVE_P (calling_window))
	Fset_frame_selected_window (calling_frame, calling_window, Qnil);

#3 in read_minibuf_unwind
  /* Restore the selected frame. */
  if (!EQ (exp_MB_frame, saved_selected_frame)
      && !NILP (exp_MB_frame))
    do_switch_frame (saved_selected_frame, 0, 0, Qt);

#4 in read_minibuf
  if (FRAMEP (calling_frame)
      && FRAME_LIVE_P (XFRAME (calling_frame))
      && (!EQ (selected_frame, calling_frame)
	  || (WINDOW_LIVE_P (XFRAME (calling_frame)->minibuffer_window)
	      && !EQ (XWINDOW (XFRAME (calling_frame)->minibuffer_window)
		      ->frame,
		      calling_frame))))
    call2 (Qselect_frame_set_input_focus, calling_frame, Qnil);

These will confuse the hell out of any window manager (and of me).  Can
some knowledgeable soul tell us what all this code is supposed to do and
whether it could be refactored in some sane way?

Many thanks in advance, martin

Message #17 received at 49248 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: martin rudalics <rudalics <at> gmx.at>
Cc: thievol <at> posteo.net, 49248 <at> debbugs.gnu.org
Subject: Re: bug#49248: 28.0.50;
 read-from-minibuffer returns a window-live-p error when its original
 window is deleted
Date: Thu, 01 Jul 2021 12:21:03 +0300

> From: martin rudalics <rudalics <at> gmx.at>
> Date: Tue, 29 Jun 2021 10:03:11 +0200
> Cc: 49248 <at> debbugs.gnu.org
> 
> Apparently, exiting from the minibuffer may select a frame no less
> than four times here:
> 
> #1 in read_minibuf_unwind
>    if (!EQ (exp_MB_frame, saved_selected_frame)
>        && !NILP (exp_MB_frame))
>      do_switch_frame (exp_MB_frame, 0, 0, Qt); /* This also sets
> 					     minibuf_window */
> 
> #2 in read_minibuf_unwind
>        else if (WINDOW_LIVE_P (calling_window))
> 	Fset_frame_selected_window (calling_frame, calling_window, Qnil);
> 
> #3 in read_minibuf_unwind
>    /* Restore the selected frame. */
>    if (!EQ (exp_MB_frame, saved_selected_frame)
>        && !NILP (exp_MB_frame))
>      do_switch_frame (saved_selected_frame, 0, 0, Qt);
> 
> #4 in read_minibuf
>    if (FRAMEP (calling_frame)
>        && FRAME_LIVE_P (XFRAME (calling_frame))
>        && (!EQ (selected_frame, calling_frame)
> 	  || (WINDOW_LIVE_P (XFRAME (calling_frame)->minibuffer_window)
> 	      && !EQ (XWINDOW (XFRAME (calling_frame)->minibuffer_window)
> 		      ->frame,
> 		      calling_frame))))
>      call2 (Qselect_frame_set_input_focus, calling_frame, Qnil);
> 
> These will confuse the hell out of any window manager (and of me).  Can
> some knowledgeable soul tell us what all this code is supposed to do and
> whether it could be refactored in some sane way?

#1 and #3 are identical, so I think we could avoid #3 by testing the
selected frame against saved_selected_frame.

#2 is only done if "the previous minibuffer displayed in this miniwindow is
dead", so I don't see a problem there.

#4 is only done if read_minibuf_unwind didn't already do it, for
whatever reason, so it's just the code trying to be defensive.
(read_minibuf_unwind must re-select the original frame in case we QUIT
or signal an error during read_minibuf.)

HTH

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