Fixes: debbugs:18880
* filenotify.el (file-notify-descriptors, file-notify-handle-event):
Adapt docstring.
(file-notify--descriptor): New defun.
(file-notify-callback, file-notify-add-watch, file-notify-rm-watch):
Adapt docstring. Handle multiple values for
`file-notify-descriptors' entries.
* net/tramp.el (tramp-handle-file-notify-rm-watch): Do not check
`file-notify-descriptors', the implementation has been changed.
src/w32notify.c (Fw32notify_add_watch): If the argument FILE is a
directory, watch it and not its parent.
(add_watch): Allow empty string in FILE.
lisp/filenotify.el (file-notify-add-watch): Don't special-case
w32notify when computing the directory to watch.
`file-notify-support'. Do not autoload. Adapt all uses.
(file-notify-supported-p): New defun.
* autorevert.el (auto-revert-use-notify): Use
`file-notify-supported-p' instead of `file-notify-support'. Adapt
docstring.
(auto-revert-notify-add-watch): Use `file-notify-supported-p'.
* net/tramp.el (tramp-file-name-for-operation):
Add `file-notify-supported-p'.
* net/tramp-sh.el (tramp-sh-handle-file-notify-supported-p):
New defun.
(tramp-sh-file-name-handler-alist): Add it as handler for
`file-notify-supported-p '.
* net/tramp-adb.el (tramp-adb-file-name-handler-alist):
* net/tramp-gvfs.el (tramp-gvfs-file-name-handler-alist):
* net/tramp-smb.el (tramp-smb-file-name-handler-alist):
Add `ignore' as handler for `file-notify-*' functions.