From: "Andreas Röhler" <andreas.roehler@easy-emacs.de>
To: 31115@debbugs.gnu.org
Subject: bug#31115: 26.1; python shell flicker
Date: Thu, 12 Apr 2018 08:20:39 +0200 [thread overview]
Message-ID: <4b3cf81a-bff1-2894-52ee-203782c4554b@easy-emacs.de> (raw)
In-Reply-To: <m2woxgz1h4.fsf@aurox.ch>
On 09.04.2018 20:19, Charles A. Roelli wrote:
> emacs -q
> M-x run-python RET C-x o
>
> Now press and hold down RET: a lot of prompts fly by, and as soon as
> point reaches the bottom of the window, there is some flicker where
> the cursor momentarily appears centered (as if `recenter' was run) and
> simultaneously all the text in the buffer blinks as if the whole
> screen was cleared and redrawn. In contrast, if you try this same
> recipe in a normal shell buffer from M-x shell, there won't be any
> flicker.
>
> Obviously, the above recipe is not a standard use case for a shell
> buffer, but the same flicker is observed during normal use too.
>
> A naive fix is to comment out the meat of python-comint-postoutput-
> scroll-to-bottom, and reevaluate it:
>
> (defun python-comint-postoutput-scroll-to-bottom (output)
> "Faster version of `comint-postoutput-scroll-to-bottom'.
> Avoids `recenter' calls until OUTPUT is completely sent."
> ;; (when (and (not (string= "" output))
> ;; (python-shell-comint-end-of-output-p
> ;; (ansi-color-filter-apply output)))
> ;; (comint-postoutput-scroll-to-bottom output))
> output)
>
> I have no idea why that works, but it seems to help. The function in
> question was added in the following commit:
>
> commit a6dc66a5441bc6832c12d362edd2d886edc1612a
> Author: Fabián Ezequiel Gallina <fgallina@gnu.org>
> Date: Sat Jul 26 23:02:38 2014 -0300
>
> Faster comint output.
>
> * lisp/progmodes/python.el:
> (python-comint-output-filter-function): Make obsolete.
> (python-comint-postoutput-scroll-to-bottom): New function.
> (inferior-python-mode): Set comint-output-filter-functions to a
> minimum.
>
> Fixes: debbugs:16875
>
>
>
Can't reproduce with GNU Emacs 26.1 (build 1, i686-pc-linux-gnu, GTK+
Version 3.14.5) of 2018-04-10 at Debian
next prev parent reply other threads:[~2018-04-12 6:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-09 18:19 bug#31115: 26.1; python shell flicker Charles A. Roelli
2018-04-12 6:20 ` Andreas Röhler [this message]
2018-04-14 14:42 ` Noam Postavsky
2022-05-07 11:56 ` Lars Ingebrigtsen
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