Backport of "closedcaption: Don't leak caps event" into 1.22
Backport of !3902 (merged) "closedcaption: Don't leak caps event".
Commits:
- d10f9a00 closedcaption: Don't leak caps event
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Backport of !3902 (merged) "closedcaption: Don't leak caps event".
Commits: