[sane-standard] Button handling

[Étienne Bersac]

Hi,

> So, SANE_CAP_HARD_SELECT is used (a) for buttons, switches etc, ie.
> "UI elements" of a scanner, that a user can set and (b) for hardware
> status, like a sensor that detects the presence of a document in an
> ADF, or the "ink level" of an imprinter.

Ok. I understand that mention clearer now :). So we only need to
normalise button option name. Nice.

Thanks.
Étienne.
-- 
Verso l'Alto !
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