Rails3: use String#html_safe for render_issue_subject_with_tree() at IssuesHelper.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@6496 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/issues_helper.rb

@@ -72,7 +72,7 @@ module IssuesHelper
     end
     s << content_tag('h3', subject)
     s << '</div>' * (ancestors.size + 1)
-    s
+    s.html_safe
   end
 
   def render_descendants_tree(issue)