Suggestion: Toggle visibility of SubTasks
Description
Right now, it gets pretty messy when dealing with many tasks and sub-tasks in the same list. I propose the ability, for example by clicking the "drag icon" (the icon to the left of the checkbox) of the parent, which would then toggle the visibility of the children (so to collapse them).
Example / Visualisation
In this case, I could press the "drag icon" on Features, which would collapse the children of that (and maybe show a indicator?).