A snackbar the screen leaves unanswered (another tab, Settings, the app
closing) now counts as expired, except across a rotation. Held back, it
could restore a snapshot from hours ago, ring a long-gone timer, or
land on top of a backup restored in the meantime. One shared
UndoSnackbarEffect does this for alarms and timers.
The engines' delete and restore run non-cancellable, so a caller
cancelled half-way cannot leave a restored alarm unscheduled. The
editor writes the label still in flight before it deletes, so Undo
brings back what was typed.
The swipe counts the touch-slop overshoot, keeps a card flung back
towards the start, slides a card home if its row is still there a
second after the delete, and no longer recomposes on every drag frame.
makiolaj
ef26d433e1