reply to pop up fix display name

src/components/Chat.vue

@@ -114,7 +114,7 @@
         <v-row class="ma-0 pa-0">
           <div v-if="replyToEvent" class="row">
             <div class="col">
-              <div class="font-weight-medium">{{ $t("message.replying_to", { user: replyToEvent.sender.name }) }}</div>
+              <div class="font-weight-medium">{{ $t("message.replying_to", { user: senderDisplayName }) }}</div>
               <div v-if="replyToContentType === 'm.text'" class="reply-text" :title="replyToEvent.getContent().body">
                 {{ replyToEvent.getContent().body | latestReply }}
               </div>
@@ -546,6 +546,9 @@ export default {
   },
 
   computed: {
+    senderDisplayName() {
+      return this.room.getMember(this.replyToEvent.sender.userId).name;
+    },
     currentUser() {
       return this.$store.state.auth.user;
     },