enable back swarm polling when we get added back to a group

ts/receiver/mediumGroups.ts

@@ -331,6 +331,8 @@ async function handleMediumGroupChange(
       // Enable typing:
       maybeConvo.set('isKickedFromGroup', false);
       maybeConvo.set('left', false);
+      // Subscribe to this group id
+      window.SwarmPolling.addGroupId(new PubKey(groupId));
       maybeConvo.updateTextInputState();
     }
   }
@@ -342,8 +344,7 @@ async function handleMediumGroupChange(
     const userSenderKey = await createSenderKeyForGroup(groupId, primary);
     window.log.warn(
       'Sharing our new senderKey with remainingMembers via message',
-      members,
-      userSenderKey
+      members
     );
 
     await shareSenderKeys(groupId, members, userSenderKey);

ts/session/snode_api/swarmPolling.ts

@@ -51,12 +51,16 @@ export class SwarmPolling {
   }
 
   public addGroupId(pubkey: PubKey) {
-    this.groupPubkeys.push(pubkey);
+    if (this.groupPubkeys.findIndex(m => m.key === pubkey.key) === -1) {
+      this.groupPubkeys.push(pubkey);
+    }
   }
 
   public addPubkey(pk: PubKey | string) {
     const pubkey = PubKey.cast(pk);
-    this.pubkeys.push(pubkey);
+    if (this.pubkeys.findIndex(m => m.key === pubkey.key) === -1) {
+      this.pubkeys.push(pubkey);
+    }
   }
 
   public removePubkey(pk: PubKey | string) {