make sticky threads visible in write-only forums

app/models/forumthread.rb

@@ -38,7 +38,7 @@ class Forumthread < ActiveRecord::Base
   def can_read?(user)
     # we might have threads without a forum
     # e.g. forum deleted
-    forum && forum.can_read?(user) || author == user
+    forum && forum.can_read?(user) || (can_write?(user) && self.sticky?) || author == user
   end
 
   def can_write?(user)