[1505] fix emoji regexp to exclude non-emoji chars

packages/stream_chat_flutter/lib/src/utils/extensions.dart

@@ -34,7 +34,7 @@ extension StringExtension on String {
     if (trimmedString.isEmpty) return false;
     if (trimmedString.characters.length > 3) return false;
     final emojiRegex = RegExp(
-      r'^(\u00a9|\u00ae|[\u2000-\u3300]|\ud83c[\ud000-\udfff]|\ud83d[\ud000-\udfff]|\ud83e[\ud000-\udfff])+$',
+      r'^(\u00a9|\u00ae|\u200d|[\ufe00-\ufe0f]|[\u2600-\u27FF]|[\u2300-\u2bFF]|\ud83c[\ud000-\udfff]|\ud83d[\ud000-\udfff]|\ud83e[\ud000-\udfff])+$',
       multiLine: true,
       caseSensitive: false,
     );

packages/stream_chat_flutter/test/src/utils/extension_test.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
@@ -81,6 +82,16 @@ void main() {
       expect('🌶1'.isOnlyEmoji, false);
       expect('👨‍👨👨‍👨'.isOnlyEmoji, true);
       expect('👨‍👨👨‍👨 '.isOnlyEmoji, true);
+      expect('👨👨👨👨'.isOnlyEmoji, false);
+      expect('⭐⭐⭐'.isOnlyEmoji, true);
+      expect('⭕⭕⭐'.isOnlyEmoji, true);
+      expect('✅'.isOnlyEmoji, true);
+      expect('☺️'.isOnlyEmoji, true);
+    });
+
+    test('korean symbols', () {
+      expect('ㅎㅎㅎ'.isOnlyEmoji, false);
+      expect('ㅎㅎㅎㅎ'.isOnlyEmoji, false);
     });
   });
 }