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d195b094b4
It's a bit arguable whether the `Subtitle` implementation supports zero-duration events, since `getEventTimeCount` is documented as effectively "the number of times the cues returns by `getCues(long)` changes", and zero-duration events violate that. However, the current `WebvttSubtitle` impl **does** produce zero-duration events, so it seems safer to handle them gracefully here and then, as a possible follow-up, fix the `WebvttSubtitle` impl (or remove it completely). Issue: androidx/media#1177 PiperOrigin-RevId: 616095798 (cherry picked from commit e9ed874e51f20460c5a73f811a7cf2c61b7530ec)