protected fun validateStateHasNotChangedSinceAdded(descriptionOfChange: String!, modelPosition: Int): Unit
This is used internally by generated models to do validation checking when "validateEpoxyModelUsage" is enabled and the model is used with a EpoxyController. This method validates that the model's hashCode hasn't been changed since it was added to the controller. This is similar to #onMutation(), but that method is only used for specific model changes such as calling a setter. By checking the hashCode, this method allows us to catch more subtle changes, such as through setting a field directly or through changing an object that is set on the model.