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e2de906 fixed the invisible reader and left an invisible message. The lock
screen is deliberately just the clock: the input field fades out while empty
(hyprlock's fade_on_empty default) and only appears once you type. So
$FPRINTPROMPT in the field's placeholder rendered faithfully into a widget
nobody sees until they have already given up on the finger and started typing
— which Bernardo reported as "unlock worked, but still no message", the same
symptom as before the fix, for a completely different reason.
I had assumed the field was visible and reasoned from there. It has never been
visible; "it has always been like this" is what cracked it.
Both candidate surfaces were tested on hardware rather than picked: a label
does expand $FPRINTPROMPT (so the line is live — "password… or scan finger",
then "scanning finger…" on touch), and fade_on_empty=false would also work.
Bernardo chose the label: it keeps the clock-only look, where the always-on
field would have made opting into fingerprint mean permanently gaining a
widget the design never had.
subtext-on-base is the palette's secondary-text role and is already held to a
3.0 floor on all 21 themes by checks.theme-contrast — the guard that exists
because two themes once shipped subtext == base and made hint text invisible,
which is the same bug as this commit, one layer down. The placeholder goes
back to its exact previous string, so the non-fingerprint path is unchanged.
Verified V2: nix flake check --no-build; checks.theme-contrast and
checks.option-docs pass. V3: Bernardo confirms the line reads on the real
lock screen — the mechanism itself is already proven on his reader.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>