Creates an idle interval in a [SceneTreeTween] animation.
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<description>
[IntervalTweener] is used to make delays in a tweening sequence. See [method SceneTreeTween.tween_interval] for more usage information.
[b]Note:[/b] [method SceneTreeTween.tween_interval] is the only correct way to create [IntervalTweener]. Any [IntervalTweener] created manually will not function correctly.