drop an expiretimer message with the same timer already on use

js/background.js

@@ -631,6 +631,7 @@
         'group'
       );
       const oldMembers = convo.get('members');
+      const oldName = convo.getName();
 
       const ev = {
         groupDetails: {
@@ -717,7 +718,7 @@
         options,
       };
 
-      if (!convo.getName() || convo.getName() !== groupName) {
+      if (oldName !== groupName) {
         updateObj.name = groupName;
       }
 

ts/receiver/queuedJob.ts

@@ -522,6 +522,16 @@ export async function handleMessageJob(
       handleSessionReset(conversation, message);
     } else if (message.isExpirationTimerUpdate()) {
       const { expireTimer } = initialMessage;
+      const oldValue = conversation.get('expireTimer');
+      if (expireTimer === oldValue) {
+        if (confirm) {
+          confirm();
+        }
+        window.console.log(
+          'Dropping ExpireTimerUpdate message as we already have the same one set.'
+        );
+        return;
+      }
       handleExpirationTimerUpdate(conversation, message, source, expireTimer);
     } else {
       await handleRegularMessage(