修正切换和国旗问题

(cherry picked from commit bec2464da85e981636077276de36b2ea5f6c40f4)

lib/app/services/singbox_imp/kr_sing_box_imp.dart

@@ -656,6 +656,51 @@ class KRSingBoxImp {
     );
   }
 
+  /// 验证节点选择是否生效
+  ///
+  /// 检查活动组中 "select" 组的 selected 字段是否是目标节点
+  Future<void> _kr_verifyNodeSelection(String targetTag) async {
+    try {
+      KRLogUtil.kr_i('🔍 开始验证节点选择: $targetTag', tag: 'SingBox');
+
+      // 查找 "select" 组
+      final selectGroup = kr_activeGroups.firstWhere(
+        (group) => group.tag == 'select',
+        orElse: () => throw Exception('未找到 "select" 选择器组'),
+      );
+
+      KRLogUtil.kr_i('📊 Select 组状态:', tag: 'SingBox');
+      KRLogUtil.kr_i('  - 组标签: ${selectGroup.tag}', tag: 'SingBox');
+      KRLogUtil.kr_i('  - 组类型: ${selectGroup.type}', tag: 'SingBox');
+      KRLogUtil.kr_i('  - 当前选中: ${selectGroup.selected}', tag: 'SingBox');
+      KRLogUtil.kr_i('  - 目标节点: $targetTag', tag: 'SingBox');
+      KRLogUtil.kr_i('  - 可用节点数: ${selectGroup.items.length}', tag: 'SingBox');
+
+      // 验证目标节点是否在可用列表中
+      final hasTarget = selectGroup.items.any((item) => item.tag == targetTag);
+      if (!hasTarget) {
+        KRLogUtil.kr_w('⚠️ 目标节点不在 select 组的可用列表中: $targetTag', tag: 'SingBox');
+        KRLogUtil.kr_w('可用节点列表:', tag: 'SingBox');
+        for (var item in selectGroup.items) {
+          KRLogUtil.kr_w('  - ${item.tag}', tag: 'SingBox');
+        }
+      }
+
+      // 检查是否切换成功
+      if (selectGroup.selected != targetTag) {
+        KRLogUtil.kr_e('❌ 节点切换验证失败！', tag: 'SingBox');
+        KRLogUtil.kr_e('  - 期望: $targetTag', tag: 'SingBox');
+        KRLogUtil.kr_e('  - 实际: ${selectGroup.selected}', tag: 'SingBox');
+        throw Exception('节点切换失败：实际选中 ${selectGroup.selected}，期望 $targetTag');
+      }
+
+      KRLogUtil.kr_i('✅ 节点切换验证成功: ${selectGroup.selected} == $targetTag', tag: 'SingBox');
+    } catch (e) {
+      KRLogUtil.kr_e('❌ 节点验证异常: $e', tag: 'SingBox');
+      // 不抛出异常，只记录日志，避免阻塞流程
+    }
+  }
+
   /// 带重试机制的节点选择
   ///
   /// 确保 command.sock 准备好后再执行节点选择
@@ -1345,7 +1390,13 @@ class KRSingBoxImp {
       // 🔧 关键修复：使用 await 等待节点选择完成
       KRLogUtil.kr_i('⏳ 调用 selectOutbound("select", "$tag")...', tag: 'SingBox');
       await _kr_selectOutboundWithRetry("select", tag, maxAttempts: 3, initialDelay: 50);
-      KRLogUtil.kr_i('✅ 节点切换完成: $tag', tag: 'SingBox');
+      KRLogUtil.kr_i('✅ 节点切换API调用完成: $tag', tag: 'SingBox');
+
+      // 🔧 新增：验证节点切换是否生效
+      await Future.delayed(const Duration(milliseconds: 300)); // 等待活动组更新
+      await _kr_verifyNodeSelection(tag);
+
+      KRLogUtil.kr_i('✅ 节点切换验证完成: $tag', tag: 'SingBox');
     } catch (e) {
       KRLogUtil.kr_e('❌ 节点选择失败: $e', tag: 'SingBox');
       rethrow; // 抛出异常，让调用者知道失败了