Stable key for when auto-follow should re-pin the live line. Changes when a new final line appears or a partial utterance starts — not on every partial text edit (which would fight mobile touch scrolling).
Number of finalized caption lines.
Id of the newest finalized line, or null.
Whether an in-progress partial is shown.
Pin identity string.
Stable key for when auto-follow should re-pin the live line. Changes when a new final line appears or a partial utterance starts — not on every partial text edit (which would fight mobile touch scrolling).