GNU bug report logs - #24465
25.1; term does not keep point position when switching buffers

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

From: Tijs Mallaerts <tijs.mallaerts <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.1; term does not keep point position when switching buffers
Date: Sun, 18 Sep 2016 21:46:12 +0000

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

To reproduce:
- start a terminal emulator with M-x term
- switch to other buffer
- switch back to *terminal* buffer

When switching back to the terminal buffer, the point position is not kept,
but set to point-min.


In GNU Emacs 25.1.2 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
 of 2016-09-17 built on kubuntu
Windowing system distributor 'The X.Org Foundation', version 11.0.11803000
System Description:    Ubuntu 16.04.1 LTS

Configured using:
 'configure --with-xwidgets'

Configured features:
XPM JPEG TIFF GIF PNG SOUND DBUS GSETTINGS NOTIFY LIBXML2 FREETYPE XFT
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XWIDGETS

Important settings:
  value of $LC_MONETARY: nl_BE.UTF-8
  value of $LC_NUMERIC: nl_BE.UTF-8
  value of $LC_TIME: nl_BE.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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  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
  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

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Making completion list...

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None found.

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Memory information:
((conses 16 86314 8240)
 (symbols 48 19667 0)
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[Message part 2 (text/html, inline)]

Message #12 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Tijs Mallaerts <tijs.mallaerts <at> gmail.com>
Cc: bug-gnu-emacs <at> gnu.org
Subject: Re: 25.1; term does not keep point position when switching buffers
Date: Mon, 10 Oct 2016 13:40:06 +0300

> From: Tijs Mallaerts <tijs.mallaerts <at> gmail.com>
> Date: Sun, 18 Sep 2016 21:46:12 +0000
> 
> To reproduce:
> - start a terminal emulator with M-x term
> - switch to other buffer
> - switch back to *terminal* buffer
> 
> When switching back to the terminal buffer, the point position is not kept, but set to point-min.

Thank you for your report.

In what version of Emacs did this issue appear?  Is it new with Emacs
25.1 or did it exist with older versions as well?

Message #15 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Tijs Mallaerts <tijs.mallaerts <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: bug-gnu-emacs <at> gnu.org
Subject: Re: 25.1; term does not keep point position when switching buffers
Date: Mon, 10 Oct 2016 21:52:46 +0200

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

> > From: Tijs Mallaerts <tijs.mallaerts <at> gmail.com>
> > Date: Sun, 18 Sep 2016 21:46:12 +0000
> >
> > To reproduce:
> > - start a terminal emulator with M-x term
> > - switch to other buffer
> > - switch back to *terminal* buffer
> >
> > When switching back to the terminal buffer, the point position is not
> kept, but set to point-min.
>
> Thank you for your report.
>
> In what version of Emacs did this issue appear?  Is it new with Emacs
> 25.1 or did it exist with older versions as well?
>

It is new with Emacs 25.1.

[Message part 2 (text/html, inline)]

Message #20 received at 24465-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Tijs Mallaerts <tijs.mallaerts <at> gmail.com>
Cc: 24465-done <at> debbugs.gnu.org
Subject: Re: bug#24465: 25.1;
 term does not keep point position when switching buffers
Date: Sat, 15 Oct 2016 17:01:34 +0300

> From: Tijs Mallaerts <tijs.mallaerts <at> gmail.com>
> Date: Mon, 10 Oct 2016 21:52:46 +0200
> Cc: bug-gnu-emacs <at> gnu.org
> 
>  > To reproduce:
>  > - start a terminal emulator with M-x term
>  > - switch to other buffer
>  > - switch back to *terminal* buffer
>  >
>  > When switching back to the terminal buffer, the point position is not kept, but set to point-min.
> 
>  Thank you for your report.
> 
>  In what version of Emacs did this issue appear? Is it new with Emacs
>  25.1 or did it exist with older versions as well?
> 
> It is new with Emacs 25.1. 

Indeed, it's a side effect of the new feature whereby subprocesses are
told to adjust their window size when the size of the buffer in which
they run changes.

I fixed this on the emacs-25 branch, so I'm marking the bug done.
Feel free to reopen if there are some left-overs.

Thanks.

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