Plezy reported a completed playback twice: the /:/timeline heartbeats let
the server mark the item played on its own, and the in-player auto-scrobble
then sent an explicit /:/scrobble for the same watch. On PMS 1.30 that adds
a second Play History row; on 1.43 the row is suppressed but viewCount still
lands on 2 for one playback.
Measured against PMS 1.43 to find what the server acts on: a watched-threshold
crossing observed inside one session. Consecutive above-threshold reports mark
nothing, a resume point left by an earlier session does not arm a new one, and
a report at position zero is inert while one at a single second is enough. So
the explicit mark now goes out only for sessions that gave the server no
crossing to observe.
That decision cannot be made while the session is live. A session beginning
past the threshold has no crossing yet, but rewinding and playing forward
creates one, and the server records it — marking eagerly and then hitting that
path leaves viewCount at 2 again. The mark is therefore deferred to the
terminal stop, and rides its future so callers that await the stop before
tearing the player down do not drop it. Deferring also covers a crossing
coalesced away during startup and a seek back below the threshold before
stopping.
Crossing state is tracked from reports the backend actually received rather
than from PlaybackReportSession.report()'s bool, which resolves true for a
same-state snapshot dropped during startup.
The same-file sibling hook (#1500) still runs exactly once, on the transition
to a settled mark rather than at the local crossing, so sibling episodes are
never marked watched while the episode actually played is not.
Local watched state and Continue Watching removal still happen on the observed
crossing, so the only behaviour that moves is the redundant server call.
close#1740
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