Adds a helper for displaying a link to add a subtask (#12113).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10661 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/issues_helper.rb

@@ -94,6 +94,11 @@ module IssuesHelper
     s.html_safe
   end
 
+  # Returns a link for adding a new subtask to the given issue
+  def link_to_new_subtask(issue)
+    link_to(l(:button_add), {:controller => 'issues', :action => 'new', :project_id => issue.project, :issue => {:parent_issue_id => issue}})
+  end
+
   class IssueFieldsRows
     include ActionView::Helpers::TagHelper