[REQUEST] Make subtasks more distinguishable from tasks

[MP]

In a queue that has many tasks with many subtasks it becomes hard to differentiate between the task/subtask levels, especially when scrolling down.

Ideally there should be a larger visual difference between the task and subtask levels, either with a larger spacing (probably not idea for small screens) or changing the shade slightly so the task ID colour fades a wee tad as the subtask level increases.

[Scott Andrew]

I'd like this

Scott