A library tab sitting under an opaque route (detail page, player) has
TickerMode disabled, so a server push arriving then was dropped while the
provider still marked the library stale; nothing observed the route pop, and
the tab stayed stale until the user switched tabs.
The tab now listens to the same effective-visibility notifier its suppression
predicate reads and, when an active stale tab becomes visible, wakes the
existing paced in-place refresh — no clearing reload, so scroll and focus
stay put. Main-tab activation still consumes the epoch first, so no second
pass is scheduled.
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