Nested subtasks navigation
When I'm in a subtask within a subtask, I'm starting to feel disoriented on where in the subtask-tree I currently am.
Two ideas for solution:
* Show full breadcrumbs so that for subtask level 2 I can see "list > task > subtask | this-subtask"
* For all subtasks of a task, we can bring forward the same subtask-overview that I get if I look within the main task, and expand all subtasks. This way the current subtask that is opened could have a special highlight (like on public maps "you are here")... this feature could be an option for the nested subtasks clickApp