Git submodule: bump libs/hbb_common from a920d00 to 7e1c392

Bumps [libs/hbb_common](https://github.com/rustdesk/hbb_common) from `a920d00` to `7e1c392`.
- [Release notes](https://github.com/rustdesk/hbb_common/releases)
- [Commits](a920d00945...7e1c392c62)

---
updated-dependencies:
- dependency-name: libs/hbb_common
  dependency-version: 7e1c392c62d39c364127307cd408421dd5f8cfb0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

flutter/lib/models/terminal_model.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 import 'package:desktop_multi_window/desktop_multi_window.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_hbb/common.dart';
 import 'package:flutter_hbb/consts.dart';
@@ -250,33 +251,6 @@ class TerminalModel with ChangeNotifier {
     }
   }
 
-  static int getExitCodeFromEvt(Map<String, dynamic> evt) {
-    if (evt.containsKey('exit_code')) {
-      final v = evt['exit_code'];
-      if (v is int) {
-        // Desktop and mobile send exit_code as an int
-        return v;
-      } else if (v is String) {
-        // Web sends exit_code as a string
-        final parsed = int.tryParse(v);
-        if (parsed != null) {
-          return parsed;
-        } else {
-          debugPrint(
-              '[TerminalModel] Failed to parse exit_code as integer: $v. Expected a numeric string.');
-          return 0;
-        }
-      } else {
-        debugPrint(
-            '[TerminalModel] Unexpected exit_code type: ${v.runtimeType}, value: $v. Expected int or String.');
-        return 0;
-      }
-    } else {
-      debugPrint('[TerminalModel] Event does not contain exit_code');
-      return 0;
-    }
-  }
-
   void handleTerminalResponse(Map<String, dynamic> evt) {
     final String? type = evt['type'];
     final int evtTerminalId = getTerminalIdFromEvt(evt);
@@ -499,7 +473,7 @@ class TerminalModel with ChangeNotifier {
   }
 
   void _handleTerminalClosed(Map<String, dynamic> evt) {
-    final int exitCode = getExitCodeFromEvt(evt);
+    final int exitCode = evt['exit_code'] ?? 0;
     _writeToTerminal('\r\nTerminal closed with exit code: $exitCode\r\n');
     _terminalOpened = false;
     notifyListeners();