Placeholder
constructor(color: Color = Color.Gray.copy(alpha = 0.35f), shape: Shape = RectangleShape, highlight: PlaceholderHighlight? = PlaceholderDefaults.fade, placeholderFadeTransitionSpec: () -> FiniteAnimationSpec<Float> = { spring() }, contentFadeTransitionSpec: () -> FiniteAnimationSpec<Float> = { spring() })