FUEL: Add prefix key behavior to fuel-test-vocab so that it is similar to other FUEL interactive functions.
FUEL: Add prefix key behavior to fuel-test-vocab so that it is similar to other FUEL interactive functions.

AlexIljin/factor,dch/factor,nicolas-p/factor,bjourne/factor,nicolas-p/factor,AlexIljin/factor,AlexIljin/factor,slavapestov/factor,AlexIljin/factor,bpollack/factor,bpollack/factor,sarvex/factor-lang,bpollack/factor,bpollack/factor,factor/factor,dch/factor,bjourne/factor,dch/factor,nicolas-p/factor,tgunr/factor,tgunr/factor,factor/factor,AlexIljin/factor,dch/factor,sarvex/factor-lang,sarvex/factor-lang,sarvex/factor-lang,slavapestov/factor,AlexIljin/factor,factor/factor,slavapestov/factor,bjourne/factor,mrjbq7/factor,factor/factor,nicolas-p/factor,factor/factor,AlexIljin/factor,bpollack/factor,sarvex/factor-lang,dch/factor,mrjbq7/factor,tgunr/factor,bjourne/factor,nicolas-p/factor,sarvex/factor-lang,bjourne/factor,tgunr/factor,slavapestov/factor,factor/factor,mrjbq7/factor,slavapestov/factor,slavapestov/factor,nicolas-p/factor,tgunr/factor,tgunr/factor,nicolas-p/factor,bpollack/factor,mrjbq7/factor,sarvex/factor-lang,bjourne/factor,slavapestov/factor,bjourne/factor,mrjbq7/factor,bpollack/factor,dch/factor,mrjbq7/factor