Return a split and sorted copy of ALIST. The returned alist DOES
NOT share structure with ALIST."
(mapcar (lambda (elt)
- (if (and (consp elt)
- (stringp (car elt))
- (listp (cdr elt)))
+ (if (imenu--subalist-p elt)
(imenu--split-menu (cdr elt) (car elt))
elt))
alist))