Coroutine scope for View

ViewCoroutineScope.kt

val View.viewScope: CoroutineScope
  get() {
    val storedScope = getTag(R.string.view_coroutine_scope) as? CoroutineScope
    if (storedScope != null) return storedScope

    val newScope = ViewCoroutineScope()
    if (isAttachedToWindow) {
      addOnAttachStateChangeListener(newScope)
      setTag(R.string.view_coroutine_scope, newScope)
    } else newScope.cancel()

    return newScope
  }

private class ViewCoroutineScope : CoroutineScope, View.OnAttachStateChangeListener {
  override val coroutineContext = SupervisorJob() + Dispatchers.Main

  override fun onViewAttachedToWindow(view: View) = Unit

  override fun onViewDetachedFromWindow(view: View) {
    coroutineContext.cancel()
    view.setTag(R.string.view_coroutine_scope, null)
  }
}

What's the point?