[ Version ( deprecated = true , deprecated_since = "1.12" , since = "1.2" ) ]
public uint easing_duration { get; set; }
Warning: easing_duration is deprecated since 1.12.
The duration of the animations, in case use_animations is set to
true.
The BoxLayout will honour the easing state of the children when allocating them.
The duration is expressed in milliseconds.