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bug#23450: 24.5; Lossing DECCKM application sequences on "fg"

From: Stefan Kangas
Subject: bug#23450: 24.5; Lossing DECCKM application sequences on "fg"
Date: Fri, 23 Aug 2019 20:04:03 +0200

Julien Palard <address@hidden> writes:

> We noticed a bug, we're reproducing it like twice a week but we're still
> unable to reproduce it explicitly, sorry for that.
> Bug is: After sending emacs to the background with `C-z` and getting it
> back with `fg`, sometimes, our terminal misses the
> [DECCKM](http://www.vt100.net/docs/vt510-rm/DECCKM.html) flag.
> We can easily fix it via `(send-string-to-terminal "\e[?1h")`, so we're
> "sure" that this flag the "missing one", but we have no proof emacs is
> faulty here.
> It look like we're not alone:
> http://stackoverflow.com/questions/4548106/screen-somehow-unmaps-my-arrow-keys-in-emacs-after-a-z/37032152
> Here, we reproduced it with:
>  - urxvt, putty, gnome term
>  - emacs 24.5.1, emacs 24.4.1
>  - GNU screen 4.02.01, 4.03.01, tmux 2.2
>  - Debian GNU/Linux 8.4 (jessie)

This sounds a lot like Bug#2772 which was recently closed as unreproducible:

Maybe we'll have better luck here.  One good piece of information that
the old bug lacked is that this is not happening consistently.

Are you still seeing this problem in a more recent version of Emacs,
preferably the latest version 26.2?

If the answer is yes, Eli Zaretskii suggested the following in the
discussion about the old bug report:

> 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.

Could you please provide us with such a termscript file?

Stefan Kangas

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