With the mailto: handling in notmuch-emacs-mua, we can update the
desktop file to advertize we can be set as the default application to
handle email. While at it, add GenericName and Comment to be more
informative.
With --hello, notmuch-emacs-mua will run (notmuch) if mailto: url is
not given.
[Desktop Entry]
Name=Notmuch (emacs interface)
-Exec=emacs -f notmuch
+GenericName=Email Client
+Comment=Emacs based email client
+Exec=notmuch-emacs-mua --hello %u
+MimeType=x-scheme-handler/mailto;
Icon=emblem-mail
Terminal=false
Type=Application