Puts back a navigation taken earlier in this process, as it was: the screen
in front and the chain with its ordinals and times. The screen runtime emits
it in two situations, both a restore and neither a new navigation: its
rollback (screenRollback), so a failed or interrupted enter or retrace
leaves the navigation as it was before it, and a switch back to a kept tab
(switchToTab), which restores the chain that tab was left with — the same
entries and ordinals, the top entry stamped with its resume time.
Puts back a navigation taken earlier in this process, as it was: the screen in front and the chain with its ordinals and times. The screen runtime emits it in two situations, both a restore and neither a new navigation: its rollback (
screenRollback), so a failed or interrupted enter or retrace leaves the navigation as it was before it, and a switch back to a kept tab (switchToTab), which restores the chain that tab was left with — the same entries and ordinals, the top entry stamped with its resume time.