@Override
    public synchronized void notifyCallbacks(ObservableList sender, int notificationType,
                                             ListChanges listChanges) {
        super.notifyCallbacks(sender, notificationType, listChanges);
        if (listChanges != null) {
            sListChanges.release(listChanges);
        }
    }
Notify registered callbacks that elements were deleted.

@param list  The list that changed.
@param start The index of the first element to be removed.
@param count The number of elements removed.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/util/obs/ListChangeRegistry.java