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Flag of imeOptions: used to request an IME that is capable of
inputting ASCII characters. The intention of this flag is to ensure that
the user can type Roman alphabet characters in a TextView.
It is typically used for an account ID or password input. A lot of the time,
IMEs are already able to input ASCII even without being told so (such IMEs
already respect this flag in a sense), but there are cases when this is not
the default. For instance, users of languages using a different script like
Arabic, Greek, Hebrew or Russian typically have a keyboard that can't
input ASCII characters by default. Applications need to be
aware that the flag is not a guarantee, and some IMEs may not respect it.
However, it is strongly recommended for IME authors to respect this flag
especially when their IME could end up with a state where only languages
using non-ASCII are enabled.
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