(Info-file-supports-index-cookies): New variable.
(Info-find-node-2): Check makeinfo version for index cookie support. (Info-index-nodes): Search for nodes with index cookies only when Info-file-supports-index-cookies is t. Otherwise, search nodes with "Index" in the node name. (Info-index-node): Search index cookie in the current node only when Info-file-supports-index-cookies is t. Otherwise, check the word "Index" in the node name. (Info-find-emacs-command-nodes): Remove code that searches nodes with "Index" node name in the top menu.
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