[Bug 245540] [NEW PORT] graphics/sane-airscan: AirScan backend for SANE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245540

--- Comment #4 from Henry Hu <henry.hu.sh at gmail.com> ---
Strictly speaking, we don't: they provide mostly the same functionality (driver
for eSCL scanners). However, we don't restrict port collection to "only 1 port
for a feature", right?

I tried to enable escl backend and it didnt' work, then I moved to this
backend. However I noticed later that it's not installed by default. After
rebuilding with AVAHI=on, it worked, although the airscan backend still have
some advantage over it:
* It shows the device name, instead of IP, in device selection.
* It defaults to 300dpi which makes more sense.
* It shows geometry in a more reasonable unit (mm).
These are minor points, so they aren't different fundamentally.

So, if you say "we only want one backend, and that's the escl backend", then
fine, please enable AVAHI by default, which may help other people as well, as
they don't need to research on why their scanners don't "just work". Otherwise,
people may at least find this port and find it useful.

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