When there is more than one misspelled word on a same line, the eventual shift is not udated.
Example: `aspell -len check text.txt'
`Salut' is replaced with `Salute' (+1 shift), and the next misspelled word is `es ' instead of `les'.
`bonjour' is replaced with `banjo' (-2 shift), and the next misspelled word is `ous.' instead of `tous'.