diff
open fun diff(smartDiffCallback: SmartDiffCallback<T>? = SmartDiffCallback(), detectMovies: Boolean = true): SmartAdapter<T>
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设置diff callback(实际使用了smartDiffCallback包装了DiffUtil.Callback).
Parameters
smart
null :取消diff，
detect
true :尝试检测移动的item，参见DiffUtil.calculateDiff.