fix: do not force ttl for groupExpireTimerUpdate

ts/components/conversation/TimerNotification.tsx

@@ -187,6 +187,7 @@ export const TimerNotification = (props: PropsForExpirationTimer) => {
   const textToRender = useTextToRender(props);
   const isGroupOrCommunity = useSelectedIsGroupOrCommunity();
   const isGroupV2 = useSelectedIsGroupV2();
+  // renderOff is true when the update is put to off, or when we have a legacy group control message (as they are not expiring at all)
   const renderOffIcon = props.disabled || (isGroupOrCommunity && !isGroupV2);
 
   if (!textToRender || textToRender.length === 0) {

ts/models/conversation.ts

@@ -882,15 +882,23 @@ export class ConversationModel extends Backbone.Model<ConversationAttributes> {
       expirationMode = 'off';
       expireTimer = 0;
     }
-    const shouldAddExpireUpdateMessage =
-      (this.isPrivate() && !fromConfigMessage) ||
-      (this.isClosedGroup() &&
-        !PubKey.isClosedGroupV3(this.id) &&
+    const shouldAddExpireUpdateMsgPrivate = this.isPrivate() && !fromConfigMessage;
+    const isLegacyGroup = this.isClosedGroup() && !PubKey.isClosedGroupV3(this.id);
+
+    /**
+     * it's ugly, but we want to add a message for legacy groups only when
+     * - not coming from a config message
+     * - effectively changes the setting
+     * - ignores a off setting for a legacy group (as we can get a setting from restored from configMessage, and a newgroup can still be in the swarm when linking a device
+     */
+    const shouldAddExpireUpdateMsgGroup =
+      isLegacyGroup &&
       !fromConfigMessage &&
-        expirationMode !== this.get('expirationMode') &&
-        expireTimer !== this.get('expireTimer') &&
-        expirationMode !== 'off' &&
-        expireTimer !== 0);
+      (expirationMode !== this.get('expirationMode') || expireTimer !== this.get('expireTimer')) &&
+      expirationMode !== 'off';
+
+    const shouldAddExpireUpdateMessage =
+      shouldAddExpireUpdateMsgPrivate || shouldAddExpireUpdateMsgGroup;
 
     // When we add a disappearing messages notification to the conversation, we want it
     // to be above the message that initiated that change, hence the subtraction.

ts/session/messages/outgoing/controlMessage/ExpirationTimerUpdateMessage.ts

@@ -1,4 +1,5 @@
 import { SignalService } from '../../../../protobuf';
+import { TTL_DEFAULT } from '../../../constants';
 import { PubKey } from '../../../types';
 import { StringUtils } from '../../../utils';
 import { DataMessage } from '../DataMessage';
@@ -60,4 +61,11 @@ export class ExpirationTimerUpdateMessage extends DataMessage {
 
     return data;
   }
+
+  public ttl(): number {
+    if (this.groupId) {
+      return TTL_DEFAULT.CONTENT_MESSAGE;
+    }
+    return super.ttl();
+  }
 }