ListWithTrash.kt

<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 -->

class ListWithTrash <T>(
   private val innerList: MutableList<T> = ArrayList<T>()
) : MutableCollection<T> by innerList {
   var deletedItem : T? = null
   override fun remove(element: T): Boolean {
       deletedItem = element
       return innerList.remove(element)
   }
   fun recover(): T? {
       return deletedItem
   }
}