(info-apropos): Speed up by using add-to-list instead of manual consing.

1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/info.el b/lisp/info.el
index d689556b321..2737999b090 100644
--- a/lisp/info.el
+++ b/lisp/info.el
@@ -2918,7 +2918,9 @@ Build a menu of the possible matches."
         (goto-char (point-min))
         (re-search-forward "\\* Menu: *\n" nil t)
         (while (re-search-forward "\\*.*: *(\\([^)]+\\))" nil t)
-          (setq manuals (cons (match-string 1) manuals)))
+          ;; add-to-list makes sure we don't have duplicates in `manuals',
+          ;; so that the following dolist loop runs faster.
+          (add-to-list 'manuals (match-string 1)))
         (dolist (manual (nreverse manuals))
           (message "Searching %s" manual)
           (condition-case err