bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Nikolay Kudryavtsev]

Hello.

This happens under some specific circumstances.

1. Start with this init and no desktop file:

(package-initialize)

(desktop-save-mode 1)
(setq desktop-save t
       desktop-dirname user-emacs-directory
       desktop-load-locked-desktop t)
(setq initial-buffer-choice (lambda () (get-buffer-create "whatever")))

2. Launch emacs 24.5 and exit it. This would create a desktop. I used 
the official 24.5 build.

3. Launch 25.1 pretest. Now there should be a horizontal scrollbar in 
every window. Happens in 25.0.95, but also in older pretests.

Happens on Windows, I'm not sure if this is platform specific issue.


In GNU Emacs 25.0.95.1 (x86_64-w64-mingw32)
  of 2016-06-12 built on LAPHROAIG
Windowing system distributor 'Microsoft Corp.', version 10.0.10586
Configured using:
  'configure --without-dbus --without-compress-install CFLAGS=-static'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS

Important settings:
   value of $LANG: RUS
   locale-coding-system: cp1251

Major mode: Fundamental

Minor modes in effect:
   desktop-save-mode: t
   tooltip-mode: t
   global-eldoc-mode: t
   electric-indent-mode: t
   mouse-wheel-mode: t
   tool-bar-mode: t
   menu-bar-mode: t
   file-name-shadow-mode: t
   global-font-lock-mode: t
   blink-cursor-mode: t
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t
   line-number-mode: t
   transient-mark-mode: t

Recent messages:
Wrote c:/Users/User/.emacs.d/.emacs.desktop.lock
Desktop: 1 frame, 0 buffers restored.
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list... [3 times]
scroll-up-command: End of buffer

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frameset finder-inf ac-nrepl-autoloads tex-site
bbdb-csv-import-autoloads flymake-php-autoloads
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fringe-helper-autoloads eieio eieio-core nose-autoloads queue-autoloads
slime-autoloads undo-tree-autoloads cl-seq cl-macs cl info package
epg-config seq byte-opt gv bytecomp byte-compile cl-extra help-mode
easymenu cconv cl-loaddefs pcase cl-lib time-date mule-util tooltip
eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
dos-w32 ls-lisp disp-table w32-win w32-vars term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame
cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote w32notify w32 multi-tty
make-network-process emacs)

Memory information:
((conses 16 127741 6703)
  (symbols 56 23884 0)
  (miscs 48 57 89)
  (strings 32 29262 5303)
  (string-bytes 1 1041268)
  (vectors 16 16444)
  (vector-slots 8 472909 4118)
  (floats 8 232 18)
  (intervals 56 243 0)
  (buffers 976 13))

-- 
Best Regards,
Nikolay Kudryavtsev

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Date: Sat, 2 Jul 2016 04:25:13 +0300
> 
> 1. Start with this init and no desktop file:
> 
> (package-initialize)
> 
> (desktop-save-mode 1)
> (setq desktop-save t
>        desktop-dirname user-emacs-directory
>        desktop-load-locked-desktop t)
> (setq initial-buffer-choice (lambda () (get-buffer-create "whatever")))
> 
> 2. Launch emacs 24.5 and exit it. This would create a desktop. I used 
> the official 24.5 build.
> 
> 3. Launch 25.1 pretest. Now there should be a horizontal scrollbar in 
> every window. Happens in 25.0.95, but also in older pretests.
> 
> Happens on Windows, I'm not sure if this is platform specific issue.

Why do you consider this a bug?  Horizontal scroll bars didn't exist
before Emacs 25.1; now they do.  So to consider this a bug, we should
establish that the scroll bars appear in buffers that don't actually
need them.  Can you point out in which buffer this happens, and why do
you think it shouldn't?

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Nikolay Kudryavtsev]

Eli, by everywhere I do mean every single buffer.

-- 
Best Regards,
Nikolay Kudryavtsev

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Cc: 23882@debbugs.gnu.org
> Date: Sat, 2 Jul 2016 13:34:15 +0300
> 
> Eli, by everywhere I do mean every single buffer.

Then I cannot reproduce that.  Using your recipe, with Emacs 25.0.95,
on MS-Windows, I get a single window displaying the buffer "whatever",
with no horizontal scroll bar.  If I switch to *scratch*, I see no
horizontal scroll bar there, either.  The value of
horizontal-scroll-bar-mode in both buffers is nil.

So I guess something else is at work here.

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> Date: Sat, 02 Jul 2016 14:02:28 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 23882@debbugs.gnu.org
> 
> > From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> > Cc: 23882@debbugs.gnu.org
> > Date: Sat, 2 Jul 2016 13:34:15 +0300
> > 
> > Eli, by everywhere I do mean every single buffer.
> 
> Then I cannot reproduce that.  Using your recipe, with Emacs 25.0.95,
> on MS-Windows, I get a single window displaying the buffer "whatever",
> with no horizontal scroll bar.  If I switch to *scratch*, I see no
> horizontal scroll bar there, either.  The value of
> horizontal-scroll-bar-mode in both buffers is nil.
> 
> So I guess something else is at work here.

And my first suspect would be the packages you have installed.
Perhaps one of them turns on horizontal-scroll-bar-mode?

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Nikolay Kudryavtsev]

I've just tested removing the whole .emacs.d. If it only contains that 
init file(and desktop file after the first load) I still get this bug.

In buggy windows horizontal-scroll-bar-mode is nil, but 
horizontal-scroll-bar is t. Doing M-x horizontal-scroll-bar-mode first 
results in "Horizontal-Scroll-Bar mode enabled" message and 
horizontal-scroll-bar-mode set to t. The second time it gets set to nil 
and the scrollbar disappears. After that I can close 25, open 24 again 
with this desktop, then open 25 again and there would be no problem.

After finding out that, I compared the broken desktop file with a 
working one and found that this is caused by having 
(horizontal-scroll-bars . t)

But then the question was, why it was only triggered with 
initial-buffer-choice.

So, in the end I've found that there are two requirements for this bug:

1. Desktop file should contain (horizontal-scroll-bars . t)

2. (buffer) form in the desktop file should have some other name than 
"*scratch*".

-- 
Best Regards,
Nikolay Kudryavtsev

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Cc: 23882@debbugs.gnu.org
> Date: Sat, 2 Jul 2016 16:19:36 +0300
> 
> So, in the end I've found that there are two requirements for this bug:
> 
> 1. Desktop file should contain (horizontal-scroll-bars . t)
> 
> 2. (buffer) form in the desktop file should have some other name than 
> "*scratch*".

Sorry, now I'm utterly confused: your initial recipe said "no desktop
file", but now you say there should be one.

So could you again show a recipe for reproducing this problem?  And,
if having package-initialize in the init file is not required, let's
remove it from the recipe.  Likewise for the other settings there:
please leave only those that are strictly necessary for the
reproduction.

And if a desktop file _is_ in fact required, please post its exact
contents.

Thanks.

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Nikolay Kudryavtsev]

[-- Attachment #1: Type: text/plain, Size: 602 bytes --]

Sorry, for the confusion, but that init is no longer needed for 
reproduction.

1. With empty .emacs.d and no init file, do M-x desktop-save.

2. Manually change buffer form in .emacs.desktop to something other than 
*scratch* or *GNU Emacs* and ensure that (horizontal-scroll-bars . t).

3. Open a new Emacs 25 session and do M-x desktop-read. This triggers 
the bug for me.

Here one desktop.el 
<https://gist.github.com/sg2002/88508b4c960aefc978eafd136f32af71> with 
which I get this problem.
<https://gist.github.com/sg2002/88508b4c960aefc978eafd136f32af71>

-- 
Best Regards,
Nikolay Kudryavtsev


[-- Attachment #2: Type: text/html, Size: 950 bytes --]

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Cc: 23882@debbugs.gnu.org
> Date: Sat, 2 Jul 2016 16:48:13 +0300
> 
> 1. With empty .emacs.d and no init file, do M-x desktop-save.
> 
> 2. Manually change buffer form in .emacs.desktop to something other than *scratch* or *GNU Emacs* and
> ensure that (horizontal-scroll-bars . t).
> 
> 3. Open a new Emacs 25 session and do M-x desktop-read. This triggers the bug for me.

But when horizontal-scroll-bars frame parameter is non-nil, Emacs
should indeed show the horizontal scroll bars, see the documentation
of that parameter.  So this doesn't seem to be a bug, but the intended
behavior.

Am I missing something?

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Nikolay Kudryavtsev]

In 24.5 horizontal-scroll-bars t is the default. So, if I want to share 
my desktops between versions, until I would be able to fully migrate to 
25.1, I have to explicitly force horizontal-scroll-bars nil in my init. 
Not a good situation, but seems like there's nothing that can be done.


But then, why would having *scratch* in buffer form would inhibit this 
behavior? This has to be a bug then.

-- 
Best Regards,
Nikolay Kudryavtsev

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Cc: 23882@debbugs.gnu.org
> Date: Sat, 2 Jul 2016 17:20:49 +0300
> 
> In 24.5 horizontal-scroll-bars t is the default.

Is it?  How do you see that?

> So, if I want to share 
> my desktops between versions, until I would be able to fully migrate to 
> 25.1, I have to explicitly force horizontal-scroll-bars nil in my init. 
> Not a good situation, but seems like there's nothing that can be done.

I think if you set it to nil once, you won't have the problem anymore.

> But then, why would having *scratch* in buffer form would inhibit this 
> behavior? This has to be a bug then.

Sorry, I don't yet see a bug.  Perhaps Martin will figure this out
better.

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Nikolay Kudryavtsev]

> Is it?  How do you see that?

Desktop files that I save from 24.5 with no init and empty .emacs.d have 
horizontal-scroll-bars t. Also that's what I get from (frame-parameters).

> I think if you set it to nil once, you won't have the problem anymore.
I delete desktops from time to time, there are some packages that have 
bugs that corrupt desktop, also I have to delete it when I change emacs 
theme and so on...

> Sorry, I don't yet see a bug.
Sorry, you're unable to reproduce this, or you don't understand why this 
would be a bug?

-- 
Best Regards,
Nikolay Kudryavtsev

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Cc: 23882@debbugs.gnu.org
> Date: Sat, 2 Jul 2016 18:02:06 +0300
> 
> > Sorry, I don't yet see a bug.
> Sorry, you're unable to reproduce this, or you don't understand why this 
> would be a bug?

Both.

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Cc: 23882@debbugs.gnu.org
> Date: Sat, 2 Jul 2016 18:02:06 +0300
> 
> > Is it?  How do you see that?
> 
> Desktop files that I save from 24.5 with no init and empty .emacs.d have 
> horizontal-scroll-bars t. Also that's what I get from (frame-parameters).
> 
> > I think if you set it to nil once, you won't have the problem anymore.
> I delete desktops from time to time, there are some packages that have 
> bugs that corrupt desktop, also I have to delete it when I change emacs 
> theme and so on...

Then I suggest to put something like this into your ~/.emacs file

  (modify-all-frames-parameters '((horizontal-scroll-bars . nil)))

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Nikolay Kudryavtsev]

If horizontal-scroll-bars t should give you scrollbars everywhere, why 
having *scratch* as a frameset buffer should disable that?

As for reproduction, don't have anything to add at the moment.

-- 
Best Regards,
Nikolay Kudryavtsev

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Cc: 23882@debbugs.gnu.org
> Date: Sat, 2 Jul 2016 18:57:39 +0300
> 
> If horizontal-scroll-bars t should give you scrollbars everywhere, why 
> having *scratch* as a frameset buffer should disable that?

I suggest to focus on finding a way to switch between Emacs 24.5 and
25.1 without hitting this problem.  Assuming we find a good way of
doing that, adding that to NEWS should allow people to avoid the
problem you bumped into.

I proposed to solve this by including this single line in your
~/.emacs:

  (modify-all-frames-parameters '((horizontal-scroll-bars . nil)))

If you do that, and then start Emacs 24.5 and save desktop, does the
problem disappear after restoring the desktop in Emacs 25.1?

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Nikolay Kudryavtsev]

Yes, this works.

-- 
Best Regards,
Nikolay Kudryavtsev

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Cc: 23882@debbugs.gnu.org
> Date: Sat, 2 Jul 2016 19:18:50 +0300
> 
> Yes, this works.

OK, thanks.  I've put this text in NEWS on the release branch:

  ***** The 'horizontal-scroll-bars' parameter was already present and non-nil
  by default in Emacs 24 (although it didn't have any effect).  This
  could cause a problem if you share your desktop files with Emacs 24:
  saving desktop in v24, then restoring it in v25.1 would turn on
  horizontal scroll bars in all buffers.  To resolve this issue, put
  this in your ~/.emacs init file

    (modify-all-frames-parameters '((horizontal-scroll-bars . nil)))

Do you think this is sufficient, and we can now close this bug?

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Nikolay Kudryavtsev]

Yes, this is sufficient. I guess it's safe to close this bug, but I wish 
we could hear from someone who could independently reproduce it. Also 
someone should still probably look into the buffer form thing, but it's 
not a priority either way, and since the release is imminent, I'm sure 
there are other things that are way more important. Thanks.

-- 
Best Regards,
Nikolay Kudryavtsev

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Cc: 23882@debbugs.gnu.org
> Date: Sat, 2 Jul 2016 19:51:25 +0300
> 
> Yes, this is sufficient. I guess it's safe to close this bug, but I wish 
> we could hear from someone who could independently reproduce it. Also 
> someone should still probably look into the buffer form thing, but it's 
> not a priority either way, and since the release is imminent, I'm sure 
> there are other things that are way more important. Thanks.

I will wait fro a few days for more feedback, and close then, if there
is none.

Thanks.

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[martin rudalics]

 > OK, thanks.  I've put this text in NEWS on the release branch:
 >
 >    ***** The 'horizontal-scroll-bars' parameter was already present and non-nil
 >    by default in Emacs 24 (although it didn't have any effect).  This

Maybe we should say something like "in all versions up to and including
Emacs 24" because that parameter was t ever since.

 >    could cause a problem if you share your desktop files with Emacs 24:
 >    saving desktop in v24, then restoring it in v25.1 would turn on
 >    horizontal scroll bars in all buffers.  To resolve this issue, put
 >    this in your ~/.emacs init file
 >
 >      (modify-all-frames-parameters '((horizontal-scroll-bars . nil)))

Many thanks for taking care of this and thanks also to Nikolay for the
report.  In fact, I was completely clueless when I first read it.

martin

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> Date: Sat, 02 Jul 2016 20:24:41 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: 23882@debbugs.gnu.org
> 
>  > OK, thanks.  I've put this text in NEWS on the release branch:
>  >
>  >    ***** The 'horizontal-scroll-bars' parameter was already present and non-nil
>  >    by default in Emacs 24 (although it didn't have any effect).  This
> 
> Maybe we should say something like "in all versions up to and including
> Emacs 24" because that parameter was t ever since.

Done.

bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Eli Zaretskii]

> Date: Sat, 02 Jul 2016 20:17:35 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 23882@debbugs.gnu.org
> 
> > From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> > Cc: 23882@debbugs.gnu.org
> > Date: Sat, 2 Jul 2016 19:51:25 +0300
> > 
> > Yes, this is sufficient. I guess it's safe to close this bug, but I wish 
> > we could hear from someone who could independently reproduce it. Also 
> > someone should still probably look into the buffer form thing, but it's 
> > not a priority either way, and since the release is imminent, I'm sure 
> > there are other things that are way more important. Thanks.
> 
> I will wait fro a few days for more feedback, and close then, if there
> is none.

No further comments, so I'm marking this bug done.

Thanks.