bug#70846: Imenu flatten

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Date: Thu, 09 May 2024 19:29:15 +0300
> 
> This patch revives the feature existed in the initial version of imenu.el,
> but that was unfortunately removed later.
> 
> When comparing it with the version in breadcrumb-jump that was discussed in
> https://lists.gnu.org/archive/html/emacs-devel/2023-12/msg00278.html
> the advantage of this version is that it doesn't use 'cl-loop':

Thanks.  If this is installed, I think it needs a NEWS entry.