The PicoCalc lane replaces the footer hint outright, so it inherits the
hint line's standing rule — never name a key that would do nothing. Until
now it named several: Retry with nothing unacknowledged, the paging pair
on a body that already fits whole, and, worst, the map's End, bound to
nothing at all while PgUp/PgDn were labelled as paging when they zoom.
An FPair now carries enabled/opp_enabled per bank. A cleared slot keeps
its label and drops its fill, landing in the same muted "nothing to
press" class as an unassigned one — so the key still reads as what it
would do, it just plainly isn't live. The dimming stays presentational:
action_for still resolves a dim slot, and the screen's own handle()
remains the authority (it no-ops), so a lane built from stale metrics can
never swallow a key that works.
Applied where a screen can tell honestly: default_lane(nav=…) for the
shared slots (result windows and the dashboard gate on content_overflows,
the chat on having a transcript), the chat's Retry on there being an
unacknowledged direct message, and the map gets its own lane — Reset,
Zoom +, Zoom - — with F2 left unassigned rather than dead. The chat's
regular-platform hint drops ^R on the same gate.
compose_base now takes the lane as a builder and calls it after the body
renders, so those gates read this paint's scroll metrics instead of the
previous paint's.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 5
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