setSubtitlePosition

Moves the subtitles up the screen: value is where the implicit bottom stack anchors, as a fraction of the viewport height, mpv's sub-pos over 100. 1.0, the default, is the ordinary bottom edge; 0.9 lifts the stack a tenth of the screen, which is what a viewer with a player bar over their subtitles wants. Explicitly positioned cues are the author's word and do not move. The active cues re-rasterise immediately; published as PlayerSnapshot.subtitlePosition.

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