bug#51006: 28.0.60; Slowness while navigating in inferior-python-mode

[Eli Zaretskii]

> From: Simen Heggestøyl <simenheg@runbox.com>
> Cc: 51006@debbugs.gnu.org, Lars Ingebrigtsen <larsi@gnus.org>
> Date: Fri, 22 Jul 2022 11:41:13 +0200
> 
> This seems to have been fixed on master by:
> 
> commit ab34293d849086a67effc52800e18bab1400ce72
> Author: Lars Ingebrigtsen <larsi@gnus.org>
> Date:   Wed Oct 13 18:44:35 2021 +0200
> 
>     Fix problem with multiline fontification in interactive Python
>     
>     * lisp/progmodes/python.el
>     (python-shell-font-lock-post-command-hook): When doing multi-line
>     (`C-c SPC') inputs, remove all the preceding lines when doing
>     fontification (bug#47657).
> 
> Should it be backported to emacs-28 as the problem still exists there?

Fine by me.