/// <summary>
/// Smoothly adjusts <see cref="Drawable.Colour"/> over time.
/// </summary>
/// <returns>A <see cref="TransformSequence{T}"/> to which further transforms can be added.</returns>
public static TransformSequence <T> FadeColour <T>(this TransformSequence <T> t, ColourInfo newColour, double duration = 0, Easing easing = Easing.None)
where T : Drawable
=> t.FadeColour(newColour, duration, new DefaultEasingFunction(easing));