include joined and kicked members on local groupUpdate

also only print name update if the name changed

js/background.js

@@ -630,6 +630,7 @@
         groupId,
         'group'
       );
+      const oldMembers = convo.get('members');
 
       const ev = {
         groupDetails: {
@@ -709,7 +710,6 @@
 
       const updateObj = {
         id: groupId,
-        name: groupName,
         avatar: nullAvatar,
         recipients,
         members,
@@ -717,6 +717,19 @@
         options,
       };
 
+      if (!convo.getName() || convo.getName() !== groupName) {
+        updateObj.name = groupName;
+      }
+
+      const addedMembers = _.difference(updateObj.members, oldMembers);
+      if (addedMembers.length > 0) {
+        updateObj.joined = addedMembers;
+      }
+      // Check if anyone got kicked:
+      const removedMembers = _.difference(oldMembers, updateObj.members);
+      if (removedMembers.length > 0) {
+        updateObj.kicked = removedMembers;
+      }
       // Send own sender keys and group secret key
       if (isMediumGroup) {
         const { chainKey, keyIdx } = await window.SenderKeyAPI.getSenderKeys(

js/models/conversations.js

@@ -1858,7 +1858,7 @@
         // if we do set an identifier here, be sure to not sync the message two times in msg.handleMessageSentSuccess()
         timestamp: now,
         groupId: id,
-        name,
+        name: name || this.getName(),
         avatar,
         members,
         admins: this.get('groupAdmins'),