Slight optimization in issue tree rendering.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3620 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/issues_helper.rb

@@ -25,7 +25,7 @@ module IssuesHelper
         ancestors.pop
       end
       yield issue, ancestors.size
-      ancestors << issue
+      ancestors << issue unless issue.leaf?
     end
   end