@Matthew:

I think we have to agree to disagree that having to press the enter key
"substiantially" increases the required time to enter the pin. 25% of
very short is still quite short :) Also the variable pin length would
allow you to enter a 3 digits pin if you don't care about security and
really don't to press 5 keys :)

Now on a serious note, if we allow variable pin lengths we have to use
the enter key, because we can't get the password length from PAM, we'd
need to store it externally which is something I'm sure Jamie disagrees
with and is also not really feasible from a technical point of view.

Regarding the scrolling field, that's also not really true as we use the
exact same visuals already for the passphrase and the passkey logins,
both cope with a flexible amount of letters/digits without having to
scroll. The passphrase one already allowing an infinite length (It
shrinks the dots and reduces spacings between them as the passphrase
grows).

Note that the passkey screen is also used for SIM PIN/PUK entry which
allows 4-8 digits. If you have a SIM PIN enabled, I find it quite
confusing that you get 2 (3 on dual sim) unlock screens, one after
another, all looking exactly the same, except the first ones requires
you to confirm the ping with enter, the last one doesn't.

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https://bugs.launchpad.net/bugs/1363214

Title:
  [System Settings] [design] allow Passcodes of variable length instead
  of just 4 digits

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