bug#2772: 23.0.91; emacsclient loses keybindings after terminal suspend/resume under screen

bug#2772: 23.0.91; emacsclient loses keybindings after terminal suspend/resume under screen

[Jakob Krainz]

When I start "emacsclient -t" under GNU screen,
then suspend it (with C-z) and resume again, it stops
understanding the arrow keys.

Instead it starts echoing error messages like
M-[ b is undefined

The value of $TERM is:
$ echo $TERM
screen


In GNU Emacs 23.0.91.1 (i386-unknown-freebsd7.1)
 of 2009-03-22 on ente.hawo.stw.uni-erlangen.de
configured using `configure  '--with-x-toolkit=no' '--without-x' '--prefix=/home/jakob/emacs' '--enable-asserts' '--without-dbus' 'CFLAGS=-O -pipe -march=pentium4 -g' 'LDFLAGS=-L/usr/pkg/lib' 'CPPFLAGS=-I/usr/pkg/include''

Important settings:
  value of $LC_ALL: de_DE.UTF-8
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: de_DE.ISO8859-15
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: de_DE.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Info

Minor modes in effect:
  show-paren-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

bug#2772: 23.0.91; emacsclient loses keybindings after terminal suspend/resume under screen

[Robert Cochran]

> When I start "emacsclient -t" under GNU screen,
> then suspend it (with C-z) and resume again, it stops
> understanding the arrow keys.
> 
> Instead it starts echoing error messages like
> M-[ b is undefined

I was unable to reproduce this with

GNU Screen 4.06.02
GNU Emacs 27.0.50 (build 1, x86_64-redhat-linux-gnu, X toolkit, Xaw3d scroll bars) of 2018-06-03

I was able to suspend the emacsclient, and then 'fg' it again. Arrow
keys were behaving as expected.

> The value of $TERM is:
> $ echo $TERM
> screen

Likewise here, FWIW.

-- 
~Robert Cochran

GPG Fingerprint - BD0C 5F8B 381C 64F0 F3CE  E7B9 EC9A 872C 41B2 77C2

bug#2772: 23.0.91; emacsclient loses keybindings after terminal suspend/resume under screen

[Noam Postavsky]

tags 2772 + unreproducible
quit

Robert Cochran <robert-emacs@cochranmail.com> writes:

> I was unable to reproduce this with
>
> GNU Screen 4.06.02
> GNU Emacs 27.0.50 (build 1, x86_64-redhat-linux-gnu, X toolkit, Xaw3d scroll bars) of 2018-06-03
>
> I was able to suspend the emacsclient, and then 'fg' it again. Arrow
> keys were behaving as expected.

I couldn't reproduce with Emacs 24.3 (oldest Emacs I have), and screen
4.05.00 either.

(I put the OP on cc, on the off chance they're still reachable after so
long)

bug#2772: 23.0.91; emacsclient loses keybindings after terminal suspend/resume under screen

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@gmail.com>
> Date: Sun, 03 Jun 2018 20:14:13 -0400
> Cc: 2772@debbugs.gnu.org, Jakob Krainz <jakob@hawo.stw.uni-erlangen.de>
> 
> Robert Cochran <robert-emacs@cochranmail.com> writes:
> 
> > I was unable to reproduce this with
> >
> > GNU Screen 4.06.02
> > GNU Emacs 27.0.50 (build 1, x86_64-redhat-linux-gnu, X toolkit, Xaw3d scroll bars) of 2018-06-03
> >
> > I was able to suspend the emacsclient, and then 'fg' it again. Arrow
> > keys were behaving as expected.
> 
> I couldn't reproduce with Emacs 24.3 (oldest Emacs I have), and screen
> 4.05.00 either.
> 
> (I put the OP on cc, on the off chance they're still reachable after so
> long)

A termscript file with all the keyboard input starting from before the
suspension, from a system where the problem can be reproduced, could
give us some hints.  See open-termscript.

bug#2772: 23.0.91; emacsclient loses keybindings after terminal suspend/resume under screen

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Noam Postavsky <npostavs@gmail.com>
>> Date: Sun, 03 Jun 2018 20:14:13 -0400
>> Cc: 2772@debbugs.gnu.org, Jakob Krainz <jakob@hawo.stw.uni-erlangen.de>
>>
>> Robert Cochran <robert-emacs@cochranmail.com> writes:
>>
>> > I was unable to reproduce this with
>> >
>> > GNU Screen 4.06.02
>> > GNU Emacs 27.0.50 (build 1, x86_64-redhat-linux-gnu, X toolkit, Xaw3d scroll bars) of 2018-06-03
>> >
>> > I was able to suspend the emacsclient, and then 'fg' it again. Arrow
>> > keys were behaving as expected.
>>
>> I couldn't reproduce with Emacs 24.3 (oldest Emacs I have), and screen
>> 4.05.00 either.
>>
>> (I put the OP on cc, on the off chance they're still reachable after so
>> long)
>
> A termscript file with all the keyboard input starting from before the
> suspension, from a system where the problem can be reproduced, could
> give us some hints.  See open-termscript.

I can't reproduce this either (arrow keys were working) with the given
recipe on:

GNU Emacs 27.0.50 (build 40, x86_64-pc-linux-gnu, X toolkit, Xaw
scroll bars) of 2019-08-08
Screen version 4.06.02 (GNU) 23-Oct-17

Since there's been no update in over a year, I'm guessing that it'll
be hard to make further progress here.  I'm therefore closing this
bug.  If anyone can reproduce this, please re-open the bug.

Thanks,
Stefan Kangas