bug#21746: 24.5; purpose of dired-keep-marker-copy?

[Eli Zaretskii]

> Date: Sat, 24 Oct 2015 01:04:06 -0700 (PDT)
> From: Drew Adams <drew.adams@oracle.com>
> Cc: 21746@debbugs.gnu.org
> 
> > There is a big difference between exposing and documenting more
> > features from dired.
> 
> We generally don't document stuff in the manual that is not
> exposed by default.

That's not true, there are a lot of stuff documented in the manual
that isn't exposed by default.  Rmail, for instance.