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;; /etc/emacs/site-start.d/50latexmk.el
;;
;; Ignore "foo.fdb_latexmk" for completion since there's normally no need to
;; visit such files.  As usual can still type "foo.fdb_latexmk" in full
;; explicitly if desired, or in fact complete from say "foo.fd" if there's
;; nothing else starting "foo.fd".
;;
(add-to-list 'completion-ignored-extensions ".fdb_latexmk")