bug#35536: 27.0.50; Expose buffer's marker list to Elisp

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Thu, 02 May 2019 15:59:38 -0400
> Cc: 35536@debbugs.gnu.org, Mauro Aranda <maurooaranda@gmail.com>
> 
> AFAIK the main reason for such a function is so that you can implement
> "replace" functions which preserves markers better than "insert+delete"
> does, right?

If this is the use case, perhaps we could provide a function to save
markers and then restore them, similar to current-window-configuration
and set-window-configuration, but with opaque handles returned to the
caller.