Redmine

Under the "Parent task" filter, the "is" operator allows users to filter tasks by specifying multiple issue IDs (#30482). I propose extending the "contains" operator to multiple issue IDs, like the "is" operator.

With this feature, you will be able to list all descendants issues of the specified issues. Currently, you can only list child issues of multiple issues with the "is" operator but there is no way to list all descendants of multiple issues because the "is" operator only accepts single issue ID.