From 425a0fe988a20d022879975f74842494e99f24e9 Mon Sep 17 00:00:00 2001
From: Jean-Philippe Lang <jp_lang@yahoo.fr>
Date: Wed, 1 May 2013 13:14:21 +0000
Subject: [PATCH] Merged r11754 from trunk (#12684).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/2.3-stable@11755 e93f8b46-1217-0410-a6f0-8f06a7374b81
---
 app/helpers/application_helper.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index e277196b5..8e2237607 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -471,7 +471,11 @@ module ApplicationHelper
   end
 
   def accesskey(s)
-    Redmine::AccessKeys.key_for s
+    @used_accesskeys ||= []
+    key = Redmine::AccessKeys.key_for(s)
+    return nil if @used_accesskeys.include?(key)
+    @used_accesskeys << key
+    key
   end
 
   # Formats text according to system settings.