Clamping currentTime in the seeking/seeked handlers is ignored on progressive
MP4 (the forward seek takes effect immediately), so the must-watch lock leaked
even though the snackbar showed.
Block at the source: a Plyr `seek` listener returns false for targets past the
watched point, which skips Plyr's default seek so the media never moves.
Rewinding and re-seeking up to the watched point stay allowed; the snackbar
fires when a forward skip is blocked. furthestSeconds is now shared between the
listener and the playback tracker. The seeking/seeked clamp is kept as a
backstop for keyboard/programmatic seeks that bypass the progress bar.
Rotimi Best
dff0476ac2