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

[Drew Adams <drew.adams@oracle.com>]

> When asked for a list of markers between BEG and END, it makes sense to
> me to return a list which ascends from BEG to END.
                            ^^^^^^^^^^^^^^^^^^^^^^^
IOW, in buffer-position order.

> If it really matters, we could either return the
> order of BUF_MARKERS unchanged,

Unchanged from what?

> or accept an additional argument which tells the
> function how to sort.

Have not really been following this thread, and
not weighing in on whether such a function is
needed or whether users need access to markers
created by C.

But as for the order of such a list: It's trivial
for users (any Lisp code) to sort by buffer position
or anything else, so why would the default order
be by buffer position?

What's _not_ available to users or Lisp code, I
think, is the order of marker creation or even the
order of last setting.  I'd think that
marker-creation order (either direction) would be
a better default sort order for this, no?