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bug#23546: 25.1.50; scroll-restore-mode breaks comint-mode


From: Dmitry Alexandrov
Subject: bug#23546: 25.1.50; scroll-restore-mode breaks comint-mode
Date: Tue, 17 May 2016 20:45:29 +0300
User-agent: Mozilla/5.0 (X11; GNU x86_64; rv:31.0) Gecko/20100101 Icedove/31.3.0

On 16/05/16 11:20, martin rudalics wrote:
I encountered a problem that looks like a bug to me: scroll-restore-mode
(from elpa.gnu.org [0]) breaks comint-mode (built-in, GNU Emacs 25.1.50.1).

[0] https://elpa.gnu.org/packages/scroll-restore.html

Steps to reproduce in a clear environment:

$ mkdir /tmp/emacs.d
$ emacs --quick --eval '(setq user-emacs-directory "/tmp/emacs.d")'

(package-initialize)
(package-refresh-contents)
(package-install 'scroll-restore)
(setq scroll-restore-jump-back t)
(scroll-restore-mode 1)

M-x shell

Now I can type the first command (c d RET), start to type the second one
— and the point jumps before shell prompt:

address@hidden:~$ cd¦
address@hidden:~$

(here ‘¦’ denotes cursor position)

I could move point back to the end manually (with M-> for instance), but
that is pretty annoying.

Could you try with ‘comint-scroll-to-bottom-on-input’ set to 'this?
That option apparently conflicts with ‘scroll-restore-jump-back’.

Yes, this option does force any input to be typed at the end-of-buffer, of course. However, the possibility to ‘C-r’ back, edit some command in-place and hit ‘RET’ — i. e. the possibility that this option disables — is exactly why I prefer shell-mode over a full-featured terminal emulator.

I have to mention that it would not present a huge problem if there were
a way disable scroll-restore-mode on per-major-mode basis.  However
scroll-restore-mode has only global state, no buffer-local, as far as I
can see.

I'm afraid that ‘scroll-restore-mode’ is too simplistic in this regard.

Alas.





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