potential fix for #2591: Bulk update missed some posts

app/logical/moderator/tag_batch_change.rb

@@ -13,6 +13,7 @@ module Moderator
       CurrentUser.without_safe_mode do
         CurrentUser.scoped(updater, updater_ip_addr) do
           ::Post.tag_match(antecedent).where("true /* Moderator::TagBatchChange#perform */").find_each do |post|
+            post.reload
             tags = (post.tag_array - normalized_antecedent + normalized_consequent).join(" ")
             post.update_attributes(:tag_string => tags)
           end