[sane-devel] a backend test

[Frank Zago]

> In the logfile of the backend I see that the option
> tstbackend is complaining about is not active:
>
> [microtek2] sane_control_option: option 21; action 1
> [microtek2] sane_control_option: option 21 not active
>
> Therefore sane_control_option fails with SANE_STATUS_INVAL.

tstbackend, for some reason, thinks the option is settable. That might be
the bug Hennig reported a while ago. Are you using the latest version?

Frank.