GitLab

(Info-find-node): split into two for Info-on-current-buffer to
  hook into it.
(Info-current-file, Info-set-mode-line, Info-up):
  Info-current-file can now be t.
(Info-clone-buffer-hook): new function for `clone-buffer'.
(Info-goto-node, Info-menu, Info-mode-map, Info-mode): make
  `clone-buffer' available in various ways to the user.