Redmine

Current "Subproject of" filter implementation allows to chose only "is" operator what does not allow to show entire project hierarchy. This is important for multi-project approach.
Please add "contains".

Environment:
  Redmine version                4.1.0.stable
  Ruby version                   2.5.7-p206 (2019-10-01) [x64-mingw32]
  Rails version                  5.2.4.1
  Environment                    production
  Database adapter               Mysql2
  Mailer queue                   ActiveJob::QueueAdapters::AsyncAdapter
  Mailer delivery                smtp
SCM:
  Subversion                     1.11.1
  Git                            2.19.1
  Filesystem                     
Redmine plugins:
  no plugin installed