ui: (Kinda) make the last message text work

lib/redux/conversation/actions.dart

@@ -4,6 +4,7 @@ class AddMessageAction extends MessageAction {
   final String body;
   final String timestamp;
   final String from;
+  final String jid;
 
-  AddMessageAction({ required this.from, required this.body, required this.timestamp });
+  AddMessageAction({ required this.from, required this.body, required this.timestamp, required this.jid });
 }

lib/redux/conversation/reducers.dart

@@ -14,14 +14,13 @@ HashMap<String, List<Message>> messageReducer(HashMap<String, List<Message>> sta
       sent: true
     );
     
-    // TODO
-    if (!map.containsKey("")) {
-      map[""] = [ msg ];
+    String jid = action.jid;
+    if (!map.containsKey(jid)) {
+      map[jid] = [ msg ];
       return map;
     }
 
-    // TODO
-    map[""]!.add(msg);
+    map[jid]!.add(msg);
     return map;
   }
 

lib/redux/conversations/reducers.dart

@@ -1,5 +1,6 @@
 import "package:moxxyv2/models/conversation.dart";
 import "package:moxxyv2/redux/conversations/actions.dart";
+import "package:moxxyv2/redux/conversation/actions.dart";
 
 List<Conversation> conversationReducer(List<Conversation> state, dynamic action) {
   if (action is AddConversationAction) {
@@ -9,6 +10,14 @@ List<Conversation> conversationReducer(List<Conversation> state, dynamic action)
         avatarUrl: action.avatarUrl,
         jid: action.jid
     ));
+  } else if (action is AddMessageAction) {
+    return state.map((element) {
+        if (element.jid == action.jid) {
+          return element.copyWith(lastMessageBody: action.body);
+        }
+
+        return element;
+    }).toList();
   }
 
   return state;