Flutter登录页Firebase Auth错误弹窗不显示问题求助

开发Flutter登录页面时，集成Firebase Auth实现登录功能，遇到错误提示弹窗不显示的问题：输入错误邮箱或密码时，页面仅停留在登录页，无任何错误弹窗提示。已按建议检查Widget的mounted状态、异步操作间隙及BuildContext并更新代码，但问题仍未解决。

相关代码如下：

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:authentication_signup/components/my_button.dart';
import 'package:authentication_signup/components/my_textfield.dart';
import 'package:authentication_signup/components/square_tile.dart';

class LoginPage extends StatefulWidget {
  const LoginPage({super.key});

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  //text editing controllers
  final usernameController = TextEditingController();
  final passwordController = TextEditingController();

  //sign user in method
  void signUserIn() async {
    //loading circle
    showDialog(context: context, builder: (context) {
      return const Center(
        child: CircularProgressIndicator(),
      );
    },);

    try {
      // Try signing in
      await FirebaseAuth.instance.signInWithEmailAndPassword(
        email: usernameController.text,
        password: passwordController.text,
      );

      // Close the loading dialog only if the widget is still mounted
      if (mounted) {
        Navigator.pop(context);
      }

    } on FirebaseAuthException catch (e) {
      // Close the loading dialog only if the widget is still mounted
      if (mounted) {
        Navigator.pop(context);
      }

      // Handle error
      if (e.code == 'user-not-found') {
        // Show error to user
        wrongEmailMessage();
      } else if (e.code == 'wrong-password') {
        // Show error to user
        wrongPasswordMessage();
      }
    } catch (e) {
      // Handle any other exceptions and close the loading dialog if mounted
      if (mounted) {
        Navigator.pop(context);
      }
      print('Error: $e');
    }
  }

  // Wrong email message pop-up
  void wrongEmailMessage() {
    if (mounted) {
      showDialog(
        context: context,
        builder: (context) {
          return const AlertDialog(
            title: Text('Incorrect email'),
            content: Text('No user found with that email.'),
          );
        },
      );
    }
  }

  // Wrong password message pop-up
  void wrongPasswordMessage() {
    if (mounted) {
      showDialog(
        context: context,
        builder: (context) {
          return const AlertDialog(
            title: Text('Incorrect password'),
            content: Text('The password you entered is incorrect.'),
          );
        },
      );
    }
  }
}

已尝试的排查方向：

• 确保Widget处于mounted状态：在调用Navigator.pop(context)或显示弹窗前检查mounted属性
• 异步间隙问题：使用mounted属性判断Widget是否仍在组件树中
• Flutter Build Context：确认调用Navigator或showDialog时使用正确的BuildContext

内容的提问来源于stack exchange，提问作者Ranita Biswas