[Feature Request] Plugin: Tasklist - Toggle to view subtasks flattened

[Trey]

I'd like the task list dialog to have a checkbox/toggle to allow a flattened view of subtasks. For users with large numbers of projects with actionable subtasks of varying due dates, this would make date sorting much more effective.

With a simple example, say I have the following tasks in a notebook:

() Parent A
    () Subtask A Due today [d: today]
    (50 other subtasks from A with no duedate)
() Parent B
    () Subtask B Due tomorrow [d: tomorrow]

Sorting by date (without collapsing A) would mean I would have to wade through 50 tasks before seeing Subtask B due tomorrow. I propose a toggle that would flatten the subtasks, so the results after sorting by date in the window would look like:

Subtask A Due today
Subtask B Due tomorrow
(Parent A, Parent B, and 50 subtasks from A sorted by some sane default like alphabetical order)

With the flatten toggle unselected, sorting would default to its current functionality.