bug#37573: 27.0.50; Remote file opened from GNOME-Nautilus

[Eli Zaretskii]

> From: Michael Albinus <michael.albinus@gmx.de>
> Cc: tim.zander@kit.edu,  37573@debbugs.gnu.org
> Date: Mon, 07 Oct 2019 09:55:12 +0200
> 
> I've tested the scenario (editing a remote file from Nautilus via Emacs)
> with GVFS volumes of different types. ftp and afp-volume work w/o
> problems. ssh/sftp behaves as reported (problem with file locking).
> 
> dav(s), google-drive and smb-share give another error:
> 
> Error: (file-error "Doing chmod" "Operation not supported" 
> "/run/user/1000/gvfs/smb-share:server=detlef,share=netlogon/tmp/tramp-test1H01tS")
> 
> So it doesn't make sense to implement the workaround in general. What we
> could do instead is to map all files under "/run/user/%d/gvfs" to the
> respective Tramp file name. Don't know whether it is worth the effort.
> 
> After all, I believe we shall simply document the behavior, and the
> workaround for ssh/sftp.

If we cannot fix this, then documenting sounds good to me.  In
etc/PROBLEMS, perhaps?