* info.el (Info-on-current-buffer): Record actual filename in
Info-current-file, instead of t, or a fake filename if a non-file buffer. Make autoload. (Info-find-node, Info-revert-find-node): No need to check for Info-current-file nil. (Info-set-mode-line, Info-up, Info-copy-current-node-name): Info-current-file is now never `t'. (Info-fontify-node): Many simplifications due to Info-current-file always being valid. Use Info-find-file to find node filename.
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