GNU bug report logs - #52385
29.0.50; Doc-View can't view separate pages in separate windows

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

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; Doc-View can't view separate pages in separate windows
Date: Wed, 08 Dec 2021 23:20:46 -0500

Package: Emacs
Version: 29.0.50


Try this:

    % emacs -Q some/multi-page.pdf
    C-x 2
    n n

You'll see that the `n` changes the page in both windows.
This was not the case in Emacs<29 where this could be used to view
different pages of the same PDF in the exact same way we can view
different "pages" of a text buffer when displayed in several windows.


        Stefan



In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo version 1.16.0, Xaw3d scroll bars)
 of 2021-12-03 built on pastel
Repository revision: 637cbc66e0083addb2e9b4b50cffa00b0050a626
Repository branch: work
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)

Configured using:
 'configure -C --enable-checking --enable-check-lisp-object-type --with-modules --with-cairo --with-tiff=ifavailable
 'CFLAGS=-Wall -g3 -Og -Wno-pointer-sign'
 PKG_CONFIG_PATH=/home/monnier/lib/pkgconfig'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND
THREADS TOOLKIT_SCROLL_BARS X11 XAW3D XDBE XIM XPM LUCID ZLIB

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

Major mode: InactiveMinibuffer

Minor modes in effect:
  shell-dirtrack-mode: t
  electric-pair-mode: t
  global-reveal-mode: t
  reveal-mode: t
  auto-insert-mode: t
  savehist-mode: t
  minibuffer-electric-default-mode: t
  global-compact-docstrings-mode: t
  url-handler-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t

Load-path shadows:
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/home/monnier/src/emacs/nongnu/packages/magit/magit-autoloads hides /home/monnier/src/emacs/nongnu/packages/magit/lisp/magit-autoloads
/home/monnier/src/emacs/nongnu/packages/magit/lisp/git-commit-pkg hides /home/monnier/src/emacs/nongnu/packages/git-commit/git-commit-pkg
/home/monnier/src/emacs/nongnu/packages/magit/lisp/magit-log hides /home/monnier/src/emacs/nongnu/packages/git-commit/lisp/magit-log
/home/monnier/src/emacs/nongnu/packages/magit/lisp/magit-diff hides /home/monnier/src/emacs/nongnu/packages/git-commit/lisp/magit-diff
/home/monnier/src/emacs/nongnu/packages/magit/lisp/magit-submodule hides /home/monnier/src/emacs/nongnu/packages/git-commit/lisp/magit-submodule
/home/monnier/src/emacs/nongnu/packages/magit/lisp/magit-push hides /home/monnier/src/emacs/nongnu/packages/git-commit/lisp/magit-push
/home/monnier/src/emacs/nongnu/packages/magit/lisp/magit-notes hides /home/monnier/src/emacs/nongnu/packages/git-commit/lisp/magit-notes
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/home/monnier/src/emacs/nongnu/packages/magit/lisp/magit-remote hides /home/monnier/src/emacs/nongnu/packages/git-commit/lisp/magit-remote
/home/monnier/src/emacs/nongnu/packages/magit/lisp/magit-mode hides /home/monnier/src/emacs/nongnu/packages/git-commit/lisp/magit-mode
/home/monnier/src/emacs/nongnu/packages/magit/lisp/magit-utils hides /home/monnier/src/emacs/nongnu/packages/git-commit/lisp/magit-utils
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/home/monnier/src/emacs/nongnu/packages/magit/lisp/git-commit hides /home/monnier/src/emacs/nongnu/packages/git-commit/lisp/git-commit
/home/monnier/src/emacs/nongnu/packages/magit/lisp/magit-git hides /home/monnier/src/emacs/nongnu/packages/git-commit/lisp/magit-git
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/home/monnier/src/emacs/nongnu/packages/magit/lisp/magit hides /home/monnier/src/emacs/nongnu/packages/git-commit/lisp/magit
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Message #8 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Fri, 10 Dec 2021 12:55:32 +0100

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

> Try this:
>
>     % emacs -Q some/multi-page.pdf
>     C-x 2
>     n n
>
> You'll see that the `n` changes the page in both windows.
> This was not the case in Emacs<29 where this could be used to view
> different pages of the same PDF in the exact same way we can view
> different "pages" of a text buffer when displayed in several windows.

I'm unable to reproduce this on the trunk.  I loaded a three page pdf,
`C-x 2', and `n n' took me to page three in the upper window only.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #11 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Fri, 10 Dec 2021 10:05:29 -0500

> I'm unable to reproduce this on the trunk.  I loaded a three page pdf,
> `C-x 2', and `n n' took me to page three in the upper window only.

Hmm... I just bootstrapped from the latest on `master` and it still
happens for me.


        Stefan

Message #14 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Sat, 11 Dec 2021 04:23:56 +0100

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

> Hmm... I just bootstrapped from the latest on `master` and it still
> happens for me.

I tried with a different PDF file, and ... Wow, that's weird.  If I
follow the recipe, hitting `n' increases to P2/6 in the window, and the
other window still says P1/6.  But nothing changes in any window -- both
are still displaying the first page.  However, if I choose the other
window and hit `n', then both windows say "P2/6" in the mode line, and
both advance to the second page.

That's...  er...  special...

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #17 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Sat, 11 Dec 2021 20:46:18 +0200

> Package: Emacs
> Version: 29.0.50
>
> Try this:
>
>     % emacs -Q some/multi-page.pdf
>     C-x 2
>     n n
>
> You'll see that the `n` changes the page in both windows.
> This was not the case in Emacs<29 where this could be used to view
> different pages of the same PDF in the exact same way we can view
> different "pages" of a text buffer when displayed in several windows.

It seems window-configuration-change-hook is not called
after splitting the window with C-x 2, and thus
image-mode-reapply-winprops is not called from this hook.

Message #20 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Thu, 16 Dec 2021 19:04:12 +0200

>>     % emacs -Q some/multi-page.pdf
>>     C-x 2
>>     n n
>>
>> You'll see that the `n` changes the page in both windows.
>> This was not the case in Emacs<29 where this could be used to view
>> different pages of the same PDF in the exact same way we can view
>> different "pages" of a text buffer when displayed in several windows.
>
> It seems window-configuration-change-hook is not called
> after splitting the window with C-x 2, and thus
> image-mode-reapply-winprops is not called from this hook.

Actually, window-configuration-change-hook is called correctly.

But the regression is in overlay window priorities:
when two overlays with 'window' properties are added
over the same region, then in 27.2 the overlay where
the overlay window matches the selected window is preferred
over the overlay with another window.  But in 28.0.90
the first overlay always wins.

Here is the shortest test case:

  (let ((o1 (make-overlay (point-min) (point-max) nil t))
        (o2 (make-overlay (point-min) (point-max) nil t)))
    (overlay-put o1 'window (selected-window))
    (overlay-put o1 'display '(image :type xpm :file "left-arrow.xpm"))
    (select-window (split-window))
    (overlay-put o2 'window (selected-window))
    (overlay-put o2 'display '(image :type xpm :file "right-arrow.xpm")))

In 27.2 it displays different images in different windows.  But
in 28.0.90 only one images is displayed in both windows.

Message #23 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Juri Linkov <juri <at> linkov.net>
Cc: monnier <at> iro.umontreal.ca, 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50;
 Doc-View can't view separate pages in separate windows
Date: Thu, 16 Dec 2021 19:44:10 +0200

> From: Juri Linkov <juri <at> linkov.net>
> Date: Thu, 16 Dec 2021 19:04:12 +0200
> Cc: 52385 <at> debbugs.gnu.org
> 
> But the regression is in overlay window priorities:
> when two overlays with 'window' properties are added
> over the same region, then in 27.2 the overlay where
> the overlay window matches the selected window is preferred
> over the overlay with another window.  But in 28.0.90
> the first overlay always wins.

If you don't assign priorities to overlays, you cannot expect any
particular order of their preferences.  It depends on random factors
you cannot control.  The window property only filters candidate
overlays, it doesn't affect their priorities for affecting the
display.

Message #26 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: monnier <at> iro.umontreal.ca, 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Thu, 16 Dec 2021 21:33:44 +0200

>> But the regression is in overlay window priorities:
>> when two overlays with 'window' properties are added
>> over the same region, then in 27.2 the overlay where
>> the overlay window matches the selected window is preferred
>> over the overlay with another window.  But in 28.0.90
>> the first overlay always wins.
>
> If you don't assign priorities to overlays, you cannot expect any
> particular order of their preferences.  It depends on random factors
> you cannot control.  The window property only filters candidate
> overlays, it doesn't affect their priorities for affecting the
> display.

Sorry for misleading info: actually, it's not about overlay priorities.
When an overlay has the ‘window’ property, then this overlay should apply
only on that window, but currently it's applied to all windows.
So still there is a bug that causes regression.

Message #29 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Juri Linkov <juri <at> linkov.net>
Cc: monnier <at> iro.umontreal.ca, 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Thu, 16 Dec 2021 22:09:04 +0200

> From: Juri Linkov <juri <at> linkov.net>
> Cc: monnier <at> iro.umontreal.ca,  52385 <at> debbugs.gnu.org
> Date: Thu, 16 Dec 2021 21:33:44 +0200
> 
> Sorry for misleading info: actually, it's not about overlay priorities.
> When an overlay has the ‘window’ property, then this overlay should apply
> only on that window, but currently it's applied to all windows.

Please show a recipe for reproducing this from "emacs -Q".

Message #32 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: monnier <at> iro.umontreal.ca, 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Fri, 17 Dec 2021 10:29:22 +0200

>> Sorry for misleading info: actually, it's not about overlay priorities.
>> When an overlay has the ‘window’ property, then this overlay should apply
>> only on that window, but currently it's applied to all windows.
>
> Please show a recipe for reproducing this from "emacs -Q".

Please see the recipe for "emacs -Q" in https://debbugs.gnu.org/52385#20

It works correctly in 28.0.90, but fails in master.

Message #35 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Juri Linkov <juri <at> linkov.net>
Cc: monnier <at> iro.umontreal.ca, 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Fri, 17 Dec 2021 14:08:44 +0200

> From: Juri Linkov <juri <at> linkov.net>
> Cc: monnier <at> iro.umontreal.ca,  52385 <at> debbugs.gnu.org
> Date: Fri, 17 Dec 2021 10:29:22 +0200
> 
> >> Sorry for misleading info: actually, it's not about overlay priorities.
> >> When an overlay has the ‘window’ property, then this overlay should apply
> >> only on that window, but currently it's applied to all windows.
> >
> > Please show a recipe for reproducing this from "emacs -Q".
> 
> Please see the recipe for "emacs -Q" in https://debbugs.gnu.org/52385#20
> 
> It works correctly in 28.0.90, but fails in master.

In that message, you said the problem happens in Emacs 28.0.90 as
well,which I couldn't reproduce.  Does that happen for you only on
master, or also on the release branch?

Message #38 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Juri Linkov <juri <at> linkov.net>, Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: monnier <at> iro.umontreal.ca, 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50;
 Doc-View can't view separate pages in separate windows
Date: Sat, 18 Dec 2021 11:11:34 +0200

> From: Juri Linkov <juri <at> linkov.net>
> Date: Thu, 16 Dec 2021 19:04:12 +0200
> Cc: 52385 <at> debbugs.gnu.org
> 
> But the regression is in overlay window priorities:
> when two overlays with 'window' properties are added
> over the same region, then in 27.2 the overlay where
> the overlay window matches the selected window is preferred
> over the overlay with another window.  But in 28.0.90
> the first overlay always wins.
> 
> Here is the shortest test case:
> 
>   (let ((o1 (make-overlay (point-min) (point-max) nil t))
>         (o2 (make-overlay (point-min) (point-max) nil t)))
>     (overlay-put o1 'window (selected-window))
>     (overlay-put o1 'display '(image :type xpm :file "left-arrow.xpm"))
>     (select-window (split-window))
>     (overlay-put o2 'window (selected-window))
>     (overlay-put o2 'display '(image :type xpm :file "right-arrow.xpm")))

Thanks for the recipe.

> In 27.2 it displays different images in different windows.  But
> in 28.0.90 only one images is displayed in both windows.

In fact, the problem existed only in Emacs 29, on the master branch.
Emacs 28 behaves correctly.

Lars, this happened due to one of the changes you made as part of
installing the support for the 'min-width' space display spec: a small
code fragment was moved inside handle_display_prop, in a way that
disabled the selection of overlays specific to windows, when those
overlays have the 'display' property.

I moved that code fragment back to where it belongs, and tested that
min-width still seems to work, both on the mode line and in the
xdisp-tests.el.  If you know about any other situation where that move
of the code was necessary, please show the recipe or tell the details.

Otherwise, this bug should be fixed now on the master branch.

Message #41 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: monnier <at> iro.umontreal.ca, 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Sat, 18 Dec 2021 19:18:14 +0200

>> Please see the recipe for "emacs -Q" in https://debbugs.gnu.org/52385#20
>>
>> It works correctly in 28.0.90, but fails in master.
>
> In that message, you said the problem happens in Emacs 28.0.90 as
> well,which I couldn't reproduce.  Does that happen for you only on
> master, or also on the release branch?

Sorry, my previous observation was incorrect.
I confirm this is fixed on master now,
and no problem was on the release branch.

Message #44 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: monnier <at> iro.umontreal.ca, 52385 <at> debbugs.gnu.org,
 Juri Linkov <juri <at> linkov.net>
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Sun, 19 Dec 2021 11:37:18 +0100

Eli Zaretskii <eliz <at> gnu.org> writes:

> Lars, this happened due to one of the changes you made as part of
> installing the support for the 'min-width' space display spec: a small
> code fragment was moved inside handle_display_prop, in a way that
> disabled the selection of overlays specific to windows, when those
> overlays have the 'display' property.

With that change, eval-ing the following will infloop (so don't eval it
in the Emacs you're using):

(insert "|" (propertize "foo" 'display '(min-width (10))) "|")

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #47 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: monnier <at> iro.umontreal.ca, 52385 <at> debbugs.gnu.org, juri <at> linkov.net
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Sun, 19 Dec 2021 15:49:42 +0200

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: Juri Linkov <juri <at> linkov.net>,  monnier <at> iro.umontreal.ca,
>   52385 <at> debbugs.gnu.org
> Date: Sun, 19 Dec 2021 11:37:18 +0100
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > Lars, this happened due to one of the changes you made as part of
> > installing the support for the 'min-width' space display spec: a small
> > code fragment was moved inside handle_display_prop, in a way that
> > disabled the selection of overlays specific to windows, when those
> > overlays have the 'display' property.
> 
> With that change, eval-ing the following will infloop (so don't eval it
> in the Emacs you're using):
> 
> (insert "|" (propertize "foo" 'display '(min-width (10))) "|")

Thanks, I think I've fixed that now.

Message #50 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: monnier <at> iro.umontreal.ca, 52385 <at> debbugs.gnu.org, juri <at> linkov.net
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Sun, 19 Dec 2021 14:54:18 +0100

Eli Zaretskii <eliz <at> gnu.org> writes:

> Thanks, I think I've fixed that now.

Thanks; that does indeed fix the problem here, too.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #53 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: monnier <at> iro.umontreal.ca, 52385 <at> debbugs.gnu.org, juri <at> linkov.net
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Sun, 19 Dec 2021 16:09:18 +0200

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: juri <at> linkov.net,  monnier <at> iro.umontreal.ca,  52385 <at> debbugs.gnu.org
> Date: Sun, 19 Dec 2021 14:54:18 +0100
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > Thanks, I think I've fixed that now.
> 
> Thanks; that does indeed fix the problem here, too.

Juri, is there anything left to take care of in this bug report, or
can it be closed now?

Message #56 received at 52385 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, monnier <at> iro.umontreal.ca,
 52385 <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Sun, 19 Dec 2021 19:12:36 +0200

>> > Thanks, I think I've fixed that now.
>>
>> Thanks; that does indeed fix the problem here, too.
>
> Juri, is there anything left to take care of in this bug report, or
> can it be closed now?

It seems the problem reported by Stefan is fixed now.

Message #61 received at 52385-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Juri Linkov <juri <at> linkov.net>
Cc: larsi <at> gnus.org, monnier <at> iro.umontreal.ca, 52385-done <at> debbugs.gnu.org
Subject: Re: bug#52385: 29.0.50; Doc-View can't view separate pages in
 separate windows
Date: Sun, 19 Dec 2021 19:31:55 +0200

> From: Juri Linkov <juri <at> linkov.net>
> Cc: Lars Ingebrigtsen <larsi <at> gnus.org>,  monnier <at> iro.umontreal.ca,
>   52385 <at> debbugs.gnu.org
> Date: Sun, 19 Dec 2021 19:12:36 +0200
> 
> >> > Thanks, I think I've fixed that now.
> >>
> >> Thanks; that does indeed fix the problem here, too.
> >
> > Juri, is there anything left to take care of in this bug report, or
> > can it be closed now?
> 
> It seems the problem reported by Stefan is fixed now.

Thanks, so I'm closing this bug.

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