The usual way to set an alarm is pick, OK, back, and back disposed the
editor's snackbar a moment after it appeared. Day taps left within the
one-second settle were never announced at all, and a rotation threw a
showing snackbar away for good.
The announcer is now an app-wide singleton holding the notice as state
until a snackbar has run to the end, so the list picks up what the
editor could not finish showing. An editor closed mid-settle announces
on the way out. Announcing is serialised, so a quick on-then-off cannot
land the "on" read last, and a notice nobody showed within ten seconds
is dropped rather than shown stale. The engine's one-alarm read now
shares upcoming()'s preview helper.
Refs #19
makiolaj
207475ef37