These are intended for use as mailto: URL handlers, not for launching
directly, so we can reduce clutter by hiding them from a desktop
environment’s menus.
* etc/emacs-mail.desktop, etc/emacsclient-mail.desktop: NoDisplay=true
We provide both an emacs.desktop and an emacsclient.desktop, so for
consistency let’s do the same with mail.
* etc/emacs-mail.desktop: Extract suggestions for using emacsclient
from comments to create emacsclient-mail.desktop.
* etc/emacsclient-mail.desktop: Send mail using an existing Emacs
rather than starting a new one.
* doc/emacs/misc.texi: (Using Emacs as a Server) Explain
emacsclient.desktop.
* etc/NEWS: (Emacs Server): Explain emacsclient.desktop.
* emacs-mail.desktop, etc/emacsclient.desktop: Automatically try to
reuse an existing frame, open a new frame, or start a new Emacs
daemon. Add actions for specific behaviours (bug#49195).
* doc/misc/message.texi (System Mailer Setup): Add index entry.
Mention option to use emacsclient.
* etc/NEWS: Mention emacsclient option for 'mailto:' handling.
* etc/emacs-mail.desktop: Add example using emacsclient.
* lisp/gnus/message.el (message-mailto): Add optional url argument
so we can call it from emacsclient.
* doc/misc/message.texi (System Mailer Setup): Document the usage.
* lisp/gnus/gnus-art.el (gnus-url-mailto): Move most of the code
here to 'message-mailto-1' (bug#38314).
* lisp/gnus/message.el (message-parse-mailto-url): Mark as obsolete.
(message-parse-mailto-url): Rewritten slightly from the above.
(message-mailto): New command.
(message-mailto-1): New function.
