pausing move_base node

edit

there's really no reason to "pause" but not cancel

what if you'd like to be sure the robot will resume moving along the exact same path as before the cancellation?

If you “ pause” it, presumably something must still be running or its the same as cancellation. If the planner is still replanning, then you’re just as likely to get a new path as if you cancelled and restarted. At no point in move base are you promised the exact same path if the environment around it has changed. If you cancel or pause with no changes then there’s no reason to expect the path will change either with a deterministic planner like provided in the stack by default.