bug#61781: 28.2; (setq-default indent-tabs-mode nil) causes weird next-line behavior in *Help*

[Eli Zaretskii]

> From: Spencer Baugh <sbaugh@janestreet.com>
> Date: Fri, 24 Feb 2023 17:32:09 -0500
> 
> >From emacs -Q:
> 
> 1. M-: (setq-default indent-tabs-mode nil) RET
> 2. Open up a help buffer, e.g. C-x 4 C-h
> 3. Move point to the link for the first binding (find-file-other-window)
> 4. C-n
> 5. Observe that in addition to moving down, point also moves back one
>    column (as if we had hit C-b).
> 
> Without indent-tabs-mode set to nil, next-line stays in the same column.

I can reproduce this in Emacs 28.2, but not in Emacs 29, since
describe-prefix-bindings in Emacs 29 no longer heeds indent-tabs-mode,
it always inserts tabs.  So if this problem still exists in Emacs 29,
you or someone else will have to come up with a different reproducer.

Thanks.