Reverts r15891 (#23318).

Deadlocks with MySQL.

git-svn-id: http://svn.redmine.org/redmine/trunk@15892 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/nested_set/issue_nested_set.rb

@@ -158,10 +158,7 @@ module Redmine
           self.class.reorder(:id).where(:root_id => sets_to_lock).lock(lock).ids
         else
           sets_to_lock = [id, parent_id].compact
-          self.class.reorder(:id).
-            joins("INNER JOIN #{self.class.table_name} t2 ON #{self.class.table_name}.root_id = t2.root_id").
-            where("t2.id IN (?)", sets_to_lock).
-            lock.ids
+          self.class.reorder(:id).where("root_id IN (SELECT root_id FROM #{self.class.table_name} WHERE id IN (?))", sets_to_lock).lock.ids
         end
       end