static int32 FindAvailableRowIndex ( [UMovieSceneTrack](API\Runtime\MovieScene\UMovieSceneTrack) * InTrack, [UMovieSceneSection](API\Runtime\MovieScene\UMovieSceneSection) * InSection, const [TArray](API\Runtime\Core\Containers\TArray)< [UMovieSceneSection](API\Runtime\MovieScene\UMovieSceneSection) * > & SectionsToDisregard )