Add new Tramp method "media"

* doc/misc/tramp.texi (Quick Start Guide, GVFS-based methods):
Add media devices.

* etc/NEWS: Mention new Tramp method "media".

* lisp/net/tramp-gvfs.el (tramp-gvfs-methods): Add "media" method.
(tramp-goa-methods): Add tramp-autoload cookie.
(tramp-media-methods): New defvar.
(tramp-gvfs-service-volumemonitor): New defsubst.
(top): Remove media methods if not supported.  Add defaults for
`tramp-default-host-alist'.
(tramp-goa-account): Rename from `tramp-goa-name'.  Adapt all callees.
(tramp-gvfs-service-afc-volumemonitor)
(tramp-gvfs-service-goa-volumemonitor)
(tramp-gvfs-service-gphoto2-volumemonitor)
(tramp-gvfs-service-mtp-volumemonitor)
(tramp-gvfs-path-remotevolumemonitor)
(tramp-gvfs-interface-remotevolumemonitor): New defconsts.
(tramp-media-device): New defstruct.
(tramp-gvfs-activation-uri): New defun.
(tramp-gvfs-url-file-name): Use it.
(tramp-gvfs-handler-mounted-unmounted)
(tramp-gvfs-connection-mounted-p, tramp-gvfs-mount-spec):
Handle "media" method.
(tramp-get-goa-account): Rename from `tramp-make-goa-name'.  Adapt
all callees.
(tramp-get-goa-accounts): Adapt docstring.  Cache with nil key.
(tramp-parse-goa-accounts, tramp-get-media-device)
(tramp-get-media-devices)
(tramp-parse-media-names): New defuns.
(top): Rework completion function registration.

* lisp/net/tramp.el (tramp-dns-sd-service-regexp): New defconst.
(tramp-set-completion-function): Use it.

Author: albinus

doc/misc/tramp.texi

@@ -557,13 +557,16 @@ of the local file name is the share exported by the remote host,
 @cindex method @option{davs}
 @cindex @option{dav} method
 @cindex @option{davs} method
+@cindex method @option{media}
+@cindex @option{media} method
 
 On systems, which have installed @acronym{GVFS, the GNOME Virtual File
 System}, its offered methods could be used by @value{tramp}.  Examples
 are @file{@trampfn{sftp,user@@host,/path/to/file}},
 @file{@trampfn{afp,user@@host,/path/to/file}} (accessing Apple's AFP
-file system), @file{@trampfn{dav,user@@host,/path/to/file}} and
-@file{@trampfn{davs,user@@host,/path/to/file}} (for WebDAV shares).
+file system), @file{@trampfn{dav,user@@host,/path/to/file}},
+@file{@trampfn{davs,user@@host,/path/to/file}} (for WebDAV shares) and
+@file{@trampfn{media,device,/path/to/file}} (for media devices).
 
 
 @anchor{Quick Start Guide: GNOME Online Accounts based methods}
@@ -1126,7 +1129,8 @@ Emacs.
 @value{tramp} does not require a host name part of the remote file
 name when a single Android device is connected to @command{adb}.
 @value{tramp} instead uses @file{@trampfn{adb,,}} as the default name.
-@command{adb devices} shows available host names.
+@command{adb devices}, run in a shell outside Emacs, shows available
+host names.
 
 @option{adb} method normally does not need user name to authenticate
 on the Android device because it runs under the @command{adbd}
@@ -1243,6 +1247,26 @@ Since Google Drive uses cryptic blob file names internally,
 could produce unexpected behavior in case two files in the same
 directory have the same @code{display-name}, such a situation must be avoided.
 
+@item @option{media}
+@cindex method @option{media}
+@cindex @option{media} method
+@cindex media
+
+Media devices, like cell phones, tablets, cameras, can be accessed via
+the @option{media} method.  Just the device name is needed in order to
+specify the remote part of file name.  However, the device must
+already be connected via USB, before accessing it.
+
+Depending on the device type, the access could be read-only.  Some
+devices are accessible under different names in parallel, offering
+different parts of their file system.
+
+@c @value{tramp} does not require a device name as part of the remote
+@c file name when a single media device is connected.  @value{tramp}
+@c instead uses @file{@trampfn{media,,}} as the default name.
+@c @c @command{adb devices}, run in a shell outside Emacs, shows available
+@c @c host names.
+
 @item @option{nextcloud}
 @cindex method @option{nextcloud}
 @cindex @option{nextcloud} method
@@ -1267,11 +1291,11 @@ that for security reasons refuse @command{ssh} connections.
 @defopt tramp-gvfs-methods
 This user option is a list of external methods for @acronym{GVFS}@.
 By default, this list includes @option{afp}, @option{dav},
-@option{davs}, @option{gdrive}, @option{nextcloud} and @option{sftp}.
-Other methods to include are @option{ftp}, @option{http},
-@option{https} and @option{smb}.  These methods are not intended to be
-used directly as @acronym{GVFS}-based method.  Instead, they are added
-here for the benefit of @ref{Archive file names}.
+@option{davs}, @option{gdrive}, @option{media}, @option{nextcloud} and
+@option{sftp}.  Other methods to include are @option{ftp},
+@option{http}, @option{https} and @option{smb}.  These methods are not
+intended to be used directly as @acronym{GVFS}-based method.  Instead,
+they are added here for the benefit of @ref{Archive file names}.
 
 If you want to use @acronym{GVFS}-based @option{ftp} or @option{smb}
 methods, you must add them to @code{tramp-gvfs-methods}, and you must

etc/NEWS

@@ -31,8 +31,8 @@ Pango instead of libXFT for font support.  Since Pango 1.44 has
 removed support for bitmapped fonts, this may require you to adjust
 your font settings.
 
-Note also that 'FontBackend' settings in .Xdefaults or .Xresources, or
-'font-backend' frame parameter settings in your init files, may need
+Note also that 'FontBackend' settings in ".Xdefaults" or ".Xresources",
+or 'font-backend' frame parameter settings in your init files, may need
 to be adjusted, as 'xft' is no longer a valid backend when using
 Cairo.  Use 'ftcrhb' if your Emacs was built with HarfBuzz support,
 and 'ftcr' otherwise.  You can determine this by checking
@@ -75,7 +75,7 @@ This file was a compatibility kludge which is no longer needed.
 ---
 ** 'lisp-mode' now uses 'common-lisp-indent-function'.
 To revert to the previous behaviour,
-(setq lisp-indent-function 'lisp-indent-function) from 'lisp-mode-hook'.
+'(setq lisp-indent-function 'lisp-indent-function)' from 'lisp-mode-hook'.
 
 ** Edebug
 
@@ -84,6 +84,12 @@ To revert to the previous behaviour,
 unconditionally aborts the current edebug instrumentation with the
 supplied error message.
 
+** Tramp
+
++++
+*** New connection method "media", which allows accessing media devices
+like cell phones, tablets or cameras.
+
 
 * New Modes and Packages in Emacs 28.1