Sync with Tramp 2.1.19.

Sync with Tramp 2.1.19.

* net/tramp-cmds.el (tramp-cleanup-all-connections)
(tramp-reporter-dump-variable, tramp-load-report-modules)
(tramp-append-tramp-buffers): Use `tramp-compat-funcall'.
(tramp-bug): Recommend setting of `tramp-verbose' to 9.

* net/tramp-compat.el (top): Do not autoload
`tramp-handle-file-remote-p'.  Load tramp-util.el and tramp-vc.el
only when `start-file-process' is not bound.
(byte-compile-not-obsolete-vars): Define if not bound.
(tramp-compat-funcall): New defmacro.
(tramp-compat-line-beginning-position)
(tramp-compat-line-end-position)
(tramp-compat-temporary-file-directory)
(tramp-compat-make-temp-file, tramp-compat-file-attributes)
(tramp-compat-copy-file, tramp-compat-copy-directory)
(tramp-compat-delete-file, tramp-compat-delete-directory)
(tramp-compat-number-sequence, tramp-compat-process-running-p):
Use it.
(tramp-advice-file-expand-wildcards): Do not use
`tramp-handle-file-remote-p'.
(tramp-compat-make-temp-file): Simplify fallback implementation.
(tramp-compat-copy-file): Add PRESERVE-SELINUX-CONTEXT.
(tramp-compat-copy-tree): Remove function.
(tramp-compat-delete-file): New defun.
(tramp-compat-delete-directory): Provide implementation for older
Emacsen.
(tramp-compat-file-attributes): Handle only
`wrong-number-of-arguments' error.

* net/tramp-fish.el (tramp-fish-handle-copy-file): Add
PRESERVE_SELINUX_CONTEXT.
(tramp-fish-handle-delete-file): Add TRASH arg.
(tramp-fish-handle-directory-files-and-attributes):
Do not use `tramp-fish-handle-file-attributes.
(tramp-fish-handle-file-local-copy)
(tramp-fish-handle-insert-file-contents)
(tramp-fish-maybe-open-connection): Use `with-progress-reporter'.

* net/tramp-gvfs.el (top): Require url-util.
(tramp-gvfs-mount-point): Remove.
(tramp-gvfs-file-name-handler-alist): Add `file-selinux-context'
and `set-file-selinux-context'.
(tramp-gvfs-stringify-dbus-message, tramp-gvfs-send-command)
(tramp-gvfs-handle-file-selinux-context)
(tramp-gvfs-handle-set-file-selinux-context): New defuns.
(with-tramp-dbus-call-method): Format trace message.
(tramp-gvfs-handle-copy-file): Handle PRESERVE-SELINUX-CONTEXT.
(tramp-gvfs-handle-copy-file, tramp-gvfs-handle-rename-file):
Implement backup call, when operation on local files fails.  Use
progress reporter.  Flush properties of changed files.
(tramp-gvfs-handle-delete-file): Add TRASH arg.  Use
`tramp-compat-delete-file'.
(tramp-gvfs-handle-expand-file-name): Expand "~/".
(tramp-gvfs-handle-make-directory): Make more traces.
(tramp-gvfs-handle-write-region): Protect deleting tmpfile.
(tramp-gvfs-url-file-name): Hexify file name in url.
(tramp-gvfs-fuse-file-name): Take also prefix (like dav shares)
into account for the resulting file name.
(tramp-gvfs-handler-askquestion): Preserve current message, in
order to let progress reporter continue afterwards.  (Bug#6257)
Return dummy mountpoint, when the answer is "no".  See
`tramp-gvfs-maybe-open-connection'.
(tramp-gvfs-handler-mounted-unmounted)
(tramp-gvfs-connection-mounted-p): Test also for new mountspec
attribute "default_location".  Set "prefix" property.  Handle
default-location.
(tramp-gvfs-mount-spec): Return both prefix and mountspec.
(tramp-gvfs-maybe-open-connection): Test, whether mountpoint
exists.  Raise an error, if not (due to a corresponding answer
"no" in interactive questions, for example). Use
`tramp-compat-funcall'.

* net/tramp-imap.el (top): Autoload `epg-make-context'.
(tramp-imap-handle-copy-file): Add PRESERVE-SELINUX-CONTEXT.
(tramp-imap-do-copy-or-rename-file)
(tramp-imap-handle-insert-file-contents)
(tramp-imap-handle-file-local-copy): Use `with-progress-reporter'.
(tramp-imap-handle-delete-file): Add TRASH arg.

* net/tramp-smb.el (tramp-smb-handle-copy-file): Add
PRESERVE-SELINUX-CONTEXT.
(tramp-smb-handle-copy-file)
(tramp-smb-handle-file-local-copy, tramp-smb-handle-rename-file)
(tramp-smb-handle-write-region, tramp-smb-maybe-open-connection):
Use `with-progress-reporter'.
(tramp-smb-handle-delete-file): Add TRASH arg.

* net/tramp.el (tramp-methods): Move hostname to the end in all
ssh `tramp-login-args'.  Add `tramp-async-args' attribute where
appropriate.
(tramp-verbose): Describe verbose level 9.
(tramp-completion-function-alist)
(tramp-file-name-regexp, tramp-chunksize)
(tramp-local-coding-commands, tramp-remote-coding-commands)
(with-connection-property, tramp-completion-mode-p)
(tramp-action-process-alive, tramp-action-out-of-band)
(tramp-check-for-regexp, tramp-file-name-p, tramp-equal-remote)
(tramp-exists-file-name-handler): Fix docstring.
(tramp-remote-process-environment): Use `format' instead of
`concat'.  Protect version string by apostroph.
(tramp-shell-prompt-pattern): Do not use a shy group in case of
XEmacs.
(tramp-file-name-regexp-unified)
(tramp-completion-file-name-regexp-unified): On W32 systems, do
not regard the volume letter as remote filename.  (Bug#5447)
(tramp-perl-file-attributes)
(tramp-perl-directory-files-and-attributes): Don't pass "$3".
(tramp-vc-registered-read-file-names): Read input as
here-document, otherwise the command could exceed maximum length
of command line.
(tramp-file-name-handler-alist): Add `file-selinux-context' and
`set-file-selinux-context'.
(tramp-debug-message): Add `tramp-compat-funcall' to ignored
backtrace functions.
(tramp-error-with-buffer): Don't show the connection buffer when
we are in completion mode.
(tramp-progress-reporter-update, tramp-remote-selinux-p)
(tramp-handle-file-selinux-context)
(tramp-handle-set-file-selinux-context, tramp-process-sentinel)
(tramp-connectable-p, tramp-open-shell, tramp-get-remote-trash):
New defuns.
(with-progress-reporter): New defmacro.
(tramp-debug-outline-regexp): New defconst.
(top, tramp-rfn-eshadow-setup-minibuffer)
(tramp-rfn-eshadow-update-overlay, tramp-handle-set-file-times)
(tramp-handle-dired-compress-file, tramp-handle-shell-command)
(tramp-completion-mode-p, tramp-check-for-regexp)
(tramp-open-connection-setup-interactive-shell)
(tramp-compute-multi-hops, tramp-read-passwd, tramp-clear-passwd)
(tramp-time-diff, tramp-coding-system-change-eol-conversion)
(tramp-set-process-query-on-exit-flag, tramp-unload-tramp):
Use `tramp-compat-funcall'.
(tramp-handle-make-symbolic-link): Flush file properties.
(tramp-handle-load, tramp-handle-file-local-copy)
(tramp-handle-insert-file-contents, tramp-handle-write-region)
(tramp-handle-vc-registered, tramp-maybe-send-script)
(tramp-find-shell): Use `with-progress-reporter'.
(tramp-do-file-attributes-with-stat): Add space in format string,
in order to work around a bug in pdksh.  Reported by Gilles Pion
<gpion@lfdj.com>.
(tramp-handle-verify-visited-file-modtime): Do not send a command
when the connection is not established.
(tramp-handle-set-file-times): Simplify the check for utc.
(tramp-handle-directory-files-and-attributes)
(tramp-get-remote-path): Use `copy-tree'.
(tramp-completion-handle-file-name-all-completions): Ensure, that
non remote files are still checked.  Oops.
(tramp-handle-copy-file, tramp-do-copy-or-rename-file): Handle
PRESERVE-SELINUX-CONTEXT.
(tramp-do-copy-or-rename-file): Add progress reporter.
(tramp-do-copy-or-rename-file-directly): Do not use
`tramp-handle-file-remote-p'.
(tramp-do-copy-or-rename-file-out-of-band):
Use `tramp-compat-delete-directory'.
(tramp-do-copy-or-rename-file-out-of-band)
(tramp-compute-multi-hops, tramp-maybe-open-connection):
Use `format-spec-make'.
(tramp-handle-delete-file): Add TRASH arg.
(tramp-handle-dired-uncache): Flush directory cache, not only file
cache.
(tramp-handle-expand-file-name)
(tramp-completion-handle-file-name-all-completions)
(tramp-completion-handle-file-name-completion): Use
`tramp-connectable-p'.
(tramp-handle-start-file-process): Set connection property "vec".
Use it, in order to invalidate file caches.  Check only for
`remote-tty' process property.
Implement tty setting.  (Bug#4604, Bug#6360)
(tramp-file-name-for-operation): Add `call-process-region' and
`set-file-selinux-context'.
(tramp-find-foreign-file-name-handler)
(tramp-advice-make-auto-save-file-name)
(tramp-set-auto-save-file-modes): Remove superfluous check for
`stringp'.  This is done inside `tramp-tramp-file-p'.
(tramp-file-name-handler): Trace 'quit.  Catch the error for some
operations when we are in completion mode.  This gives the user
the chance to correct the file name in the minibuffer.
(tramp-completion-mode-p): Use `non-essential'.
(tramp-handle-file-name-all-completions): Backward/ XEmacs
compatibility: Use `completion-ignore-case' if
`read-file-name-completion-ignore-case' does not exist.
(tramp-get-debug-buffer): Use `tramp-debug-outline-regexp'.
(tramp-find-shell, tramp-open-connection-setup-interactive-shell):
`tramp-open-shell'.
(tramp-action-password): Hide password prompt before next run.
(tramp-process-actions): Widen connection buffer for the trace.
(tramp-open-connection-setup-interactive-shell): Set `remote-tty'
process property.  Trace stty settings if `tramp-verbose' >= 9.
Apply workaround for IRIX64 bug.  Move argument of last
`tramp-send-command' where it belongs to.
(tramp-maybe-open-connection): Use `async-args' and `gw-args' in
front of `login-args'.
(tramp-get-ls-command, tramp-get-ls-command-with-dired): Run tests
on "/dev/null" instead of "/".
(tramp-get-ls-command-with-dired): Make test for "--dired"
stronger.
(tramp-set-auto-save-file-modes): Adapt version check.
(tramp-set-process-query-on-exit-flag): Fix wrong parentheses.
(tramp-handle-process-file): Call the program in a subshell, in
order to preserve working directory.
(tramp-handle-shell-command): Don't use hard-wired "/bin/sh" but
`tramp-remote-sh' from `tramp-methods'.
(tramp-get-ls-command): Make test for "--color=never" stronger.
(tramp-check-for-regexp): Use (forward-line 1).

* net/trampver.el: Update release number.

* net/tramp-gvfs.el (tramp-gvfs-handle-copy-file): Do not pass
empty argument to gvfs-copy.

* net/tramp-compat.el (tramp-compat-delete-file): Rewrite to
handle new TRASH arg of `delete-file'.

* net/tramp.el (tramp-handle-insert-directory): Don't use
`forward-word', its default syntax could be changed.

Implement compression for inline methods.

* net/tramp.el (tramp-inline-compress-start-size): New defcustom.
(tramp-copy-size-limit): Allow also nil.
(tramp-inline-compress-commands): New defconst.
(tramp-find-inline-compress, tramp-get-inline-compress)
(tramp-get-inline-coding): New defuns.
(tramp-get-remote-coding, tramp-get-local-coding): Remove,
replaced by `tramp-get-inline-coding'.
(tramp-handle-file-local-copy, tramp-handle-write-region)
(tramp-method-out-of-band-p): Use `tramp-get-inline-coding'.

Detect ssh 'ControlMaster' argument automatically in some cases.

* net/tramp.el (tramp-detect-ssh-controlmaster): New defun.
(tramp-default-method): Use it.

* net/tramp.el (tramp-file-name-for-operation):
Add file-selinux-context.