Redmine

It seems that the issue sort order set when creating custom query does not work when "Parent task" is involved.
Take a look on attached query screen shoot. It is a query that sorts first by "Parent task" to show hierarchy and then by "Update" field. The marked issues 21047 and 21069 have the same parent as others but much older date and should be listed at the end.

Also the change introduced in #2871 does not seem to work.

Environment:
  Redmine version                3.0.1.stable
  Ruby version                   2.0.0-p594 (2014-10-27) [i386-mingw32]
  Rails version                  4.2.0
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.8.11
  Git                            1.9.5
  Filesystem                     
Redmine plugins:
  inside_avatar                  1.0.2
  parent_issue_filter            1.0.1
  redmine_agile                  1.3.8
  redmine_spent_time_column      2.1.0
  redmine_version_fixed_issues   1.0.0
  sidebar_hide                   0.0.7