[O] Using checkboxes: nested lists

[address@hidden]

Hello again,

  Is there a way to have nested lists.  The example below would have
maintest to be all marked only when all test4 items would be checked.
This is not the case now as maintest is checked 2/2 as if test4 was a
different item not at the same identation level below maintest.  

- [2/2] maintest
  - [X] test2
  - [X] test3
  - [1/2] test4
    - [X] test4a
    - [ ] test4b

Thanks.