Added value to Message fourByteRoomContactKey which holds the first 4 bytes of the contacts pub key that posted the message to the room.

lib/models/message.dart

@@ -23,6 +23,7 @@ class Message {
   final int? pathLength;
   final Uint8List pathBytes;
   final Map<String, int> reactions;
+  final Uint8List fourByteRoomContactKey;
 
   Message({
     required this.senderKey,
@@ -40,8 +41,10 @@ class Message {
     this.tripTimeMs,
     this.pathLength,
     Uint8List? pathBytes,
+    Uint8List? fourByteRoomContactKey,
     Map<String, int>? reactions,
   })  : pathBytes = pathBytes ?? Uint8List(0),
+        fourByteRoomContactKey = fourByteRoomContactKey ?? Uint8List(0),
         reactions = reactions ?? {};
 
   String get senderKeyHex => pubKeyToHex(senderKey);
@@ -58,6 +61,7 @@ class Message {
     Uint8List? pathBytes,
     bool? isCli,
     Map<String, int>? reactions,
+    Uint8List? fourByteRoomContactKey,
   }) {
     return Message(
       senderKey: senderKey,
@@ -76,6 +80,7 @@ class Message {
       pathLength: pathLength ?? this.pathLength,
       pathBytes: pathBytes ?? this.pathBytes,
       reactions: reactions ?? this.reactions,
+      fourByteRoomContactKey: fourByteRoomContactKey ?? this.fourByteRoomContactKey,
     );
   }
 

lib/screens/room_chat_screen.dart

@@ -209,13 +209,13 @@ class _RoomChatScreenState extends State<RoomChatScreen> {
         final message = messages[index];
         final contact = _resolveContactFrom4Bytes(
           connector,
-          Uint8List.fromList(message.text.substring(0, 4.clamp(0, message.text.length)).codeUnits),
+          message.fourByteRoomContactKey.isEmpty ? Uint8List.fromList([0, 0, 0, 0]) : message.fourByteRoomContactKey,
         );
-        
+        final fourByteHex = message.fourByteRoomContactKey.map((b) => b.toRadixString(16).padLeft(2, '0')).join().toUpperCase();
         return _MessageBubble(
           message: message,
-          senderName: contact.name,
-          onTap: () => _openMessagePath(message),
+          senderName: "${contact.name} [$fourByteHex]",
+          onTap: () => _openMessagePath(message, contact),
           onLongPress: () => _showMessageActions(message),
         );
       },
@@ -747,10 +747,11 @@ class _RoomChatScreenState extends State<RoomChatScreen> {
   }
 
 
-  void _openMessagePath(Message message) {
+  void _openMessagePath(Message message, Contact contact) {
     final connector = context.read<MeshCoreConnector>();
+    final fourByteHex = message.fourByteRoomContactKey.map((b) => b.toRadixString(16).padLeft(2, '0')).join().toUpperCase();
     final senderName =
-        message.isOutgoing ? (connector.selfName ?? 'Me') : widget.contact.name;
+        message.isOutgoing ? (connector.selfName ?? 'Me') : "${contact.name} [$fourByteHex]";
     final pathMessage = ChannelMessage(
       senderKey: null,
       senderName: senderName,
@@ -899,8 +900,6 @@ class _MessageBubble extends StatelessWidget {
         ? colorScheme.onErrorContainer
         : (isOutgoing ? colorScheme.onPrimary : colorScheme.onSurface);
     final metaColor = textColor.withValues(alpha: 0.7);
-    final bytes4 = Uint8List.fromList(message.text.substring(0, 4.clamp(0, message.text.length)).codeUnits);
-    final hexString = bytes4.map((b) => b.toRadixString(16).padLeft(2, '0')).join().toUpperCase();
     final messageText = message.text.substring(4.clamp(0, message.text.length));
     return Padding(
       padding: const EdgeInsets.symmetric(vertical: 4),
@@ -954,7 +953,7 @@ class _MessageBubble extends StatelessWidget {
                       if(!isOutgoing)
                         
                         Text(
-                          "[$hexString] $messageText",
+                          messageText,
                           style: TextStyle(
                             color: textColor,
                           ),

lib/storage/message_store.dart

@@ -52,6 +52,7 @@ class MessageStore {
       'pathLength': msg.pathLength,
       'pathBytes': msg.pathBytes.isNotEmpty ? base64Encode(msg.pathBytes) : null,
       'reactions': msg.reactions,
+      'fourByteRoomContactKey': base64Encode(msg.fourByteRoomContactKey),
     };
   }
 
@@ -86,6 +87,7 @@ class MessageStore {
       reactions: (json['reactions'] as Map<String, dynamic>?)?.map(
         (key, value) => MapEntry(key, value as int),
       ) ?? {},
+      fourByteRoomContactKey: Uint8List.fromList(base64Decode(json['fourByteRoomContactKey'] as String)),
     );
   }
 }