(Info-streamline-headings): New var.
(Info-dir-remove-duplicates): New fun. (Info-insert-dir): Use it. Simplify the code with push,mapc,dolist. (Info-select-node): Simplify handling of Info-header-line. (Info-forward-node): Undo 2000/12/15 since we don't narrow any more. (Info-mode): Set header-line-format once and for all. (Info-fontify-node): Accept bogus first line with `File:' missing. Only make first line invisible if Info-use-header-line. Don't use `intangible': it's evil. Use inhibit-read-only. (Info-follow-reference, Info-next-reference, Info-prev-reference) (Info-try-follow-nearest-node): Don't bind inhibit-point-motion-hooks since we don't use intangible any more.
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