Eli Zaretskii <eliz@gnu.org> writes:

>> +         (is-info (and ifile
>> +                       (or (assoc-string (concat ifi ".info") ifiles)
>> +                           ;; the top info "dir" file
>> +                           (assoc-string (concat ifi ".info.gz") ifiles)
>> +                           ;; info files might be archived!
>> +                           (when pdir (string-match pdir ifile)))
>> +                       (not (assoc-string ifi ndocu)))))
>
> This should probably be extended to allow more extensions; see
> Info-suffix-list.

Please see the latest iteration of patches.

I'm now working on converting the toggle function to a minor-mode, as
Drew and Stefan suggested..