[Feature Request] Show subtasks that are due

[GideonWolfe]

Steps to reproduce

1. Add task
2. Add subtask to that task and create a due date for it
3. Go to the "This week" tab, the task with a deadline does not appear

Expected behaviour

Tasks that have a due date should be displayed with all the other ones.

Actual behaviour

They aren't. I use the tasks to manage assignments for classes, but if I create a subtask under the main "Homework" task, I am unable to see them in the special menus. If I wanted to see things due "This Week", it would not appear.

[raimund-schluessler]

Thanks for the report, this is already tracked in #83 and will be closed with #431.