Handle multiple Info buffers.
(Info-tag-table-marker): Initialize to nil. (Info-tag-table-buffer): New variable. (Info-find-node): Don't switch buffers if already in Info mode. Use Info-tag-table-buffer to support multiple Info buffers. (Info-read-subfile): Don't switch to *info* buffer. (Info-build-node-completions): Handle buffer local bindings for Info-tag-table-marker. (Info-search): Add a save-excursion. (Info-mode): Make Info-tag-table-buffer buffer-local. Make a different marker in Info-tag-table-marker for each buffer. (Info-kill-buffer): New function, on kill-buffer-hook.
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