* doc/misc/tramp.texi (File name completion): User and host name
completion is also performed by auth-sources search.
* etc/NEWS: Document remote file name completion using auth-sources.
* lisp/net/tramp.el (tramp-completion-use-auth-sources):
New user option.
(tramp-parse-auth-sources): New defun.
(tramp-get-completion-function): Call it.
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