GNU bug report logs - #21139
25.0.50; shell-mode doesn't respect comint-scroll-to-bottom-on-output/input

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Message #24 received at 21139-done <at> debbugs.gnu.org (full text, mbox):

From: Artur Malabarba <bruce.connor.am <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 21139-done <at> debbugs.gnu.org
Subject: Re: bug#21139: 25.0.50;
 shell-mode doesn't respect comint-scroll-to-bottom-on-output/input
Date: Sat, 8 Aug 2015 19:01:54 +0100

THanks Eli. Indeed, that's what I was looking for.
I'll close this now.

2015-08-08 10:03 GMT+01:00 Eli Zaretskii <eliz <at> gnu.org>:
>> Date: Mon, 27 Jul 2015 11:46:56 +0100
>> From: Artur Malabarba <bruce.connor.am <at> gmail.com>
>>
>> 1. Set `comint-scroll-to-bottom-on-output` and
>> `comint-scroll-to-bottom-on-input` to nil via the customize interface
>> (or via `setq-default`)
>> 2. Run `M-x shell`
>> 3. Run a couple of shell commands so you have enough output to fill
>> the screen (`ls -al ~/` should do it).
>> 4. Hit `C-l` twice so point is at the top of the screen.
>> 5. Type `date` on the prompt and hit `RET`.
>> 6. The window scrolls until point is at the bottom.
>>
>>
>> It would seem that, by setting those variables to nil, the window
>> should not scroll. If this is not intended to be the case, then these
>> variables' docstrings are unclear to me.
>
> The variable comint-scroll-to-bottom-on-output
> (a.k.a. comint-move-point-for-output) control whether _point_ moves.
> In the scenario you described, point does not move, it stays at EOB.
> What happens is that the window is scrolled to place point on the last
> line of the window; this is controlled by another variable,
> comint-scroll-show-maximum-output, which attempts to show as much of
> the shell buffer as possible.  if you set it to nil, you will have
> what you want in this scenario.
>
> IOW, this doesn't look like a bug, but intended behavior, and you need
> to customize another variable to have what you want.

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