expandReplies method
Implementation
Future<void> expandReplies(String commentId) async {
final index = _comments.indexWhere((c) => c.id == commentId);
if (index != -1) {
final replies = await controller.getReplies(commentId, 1);
_comments[index] = _comments[index].copyWith(replies: replies);
_replyPageByComment[commentId] = 1;
notifyListeners();
}
}