void notifyGroupItemRangeInserted(int groupPositionStart, int count, boolean expanded) {
int insertedCount = mPositionTranslator.insertGroupItems(groupPositionStart, count, expanded);
if (insertedCount > 0) {
final long packedPosition = ExpandableAdapterHelper.getPackedPositionForGroup(groupPositionStart);
final int flatPosition = mPositionTranslator.getFlatPosition(packedPosition);
notifyItemRangeInserted(flatPosition, insertedCount);
raiseOnGroupExpandedSequentially(groupPositionStart, count, false, null);
}
}