Close unclosed pre/code tags (#4265).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3590 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/application_helper.rb

@@ -439,6 +439,10 @@ module ApplicationHelper
         parsed << full_tag
       end
     end
+    # Close any non closing tags
+    while tag = tags.pop
+      parsed << "</#{tag}>"
+    end
     parsed
   end