fix: change message edit logic (#144)

if the edited message isn't different from the original message, then do nothing.

components/Chat/ChatMessage.tsx

@@ -32,7 +32,9 @@ export const ChatMessage: FC<Props> = ({ message, messageIndex, lightMode, onEdi
   };
 
   const handleEditMessage = () => {
-    onEditMessage({ ...message, content: messageContent }, messageIndex);
+    if (message.content != messageContent) {
+      onEditMessage({ ...message, content: messageContent }, messageIndex);
+    }
     setIsEditing(false);
   };