use predictive conversion

[h-youhei]

If I can select candidate by numeric keys, predictive conversion seems to be useful.

Possible implementation is this

no input

input number

preedit

1. change state to predictive conversion
2. select candidate by number

conversion

select candidate by number

To implement it, input state should be handled by the keyboard.

starting state: no input
some character: preedit
convert or predict: conversion
commit: no input
ime off: no input

[h-youhei]

changing state

direct input

after IME off

precomposition

after IME on
after commit

composition

after character input

conversion

after convert