Fix bad group state when requesting to rejoin a group.

app/src/main/java/org/thoughtcrime/securesms/groups/GroupManagerV2.java

@@ -937,6 +937,14 @@ final class GroupManagerV2 {
 
       if (group.isPresent()) {
         Log.i(TAG, "Group already present locally");
+        if (decryptedChange != null) {
+          try {
+            groupsV2StateProcessor.forGroup(SignalStore.account().getServiceIds(), groupMasterKey)
+                                  .updateLocalGroupToRevision(decryptedChange.getRevision(), System.currentTimeMillis(), decryptedChange);
+          } catch (GroupNotAMemberException e) {
+            Log.w(TAG, "Unable to apply join change to existing group", e);
+          }
+        }
       } else {
         groupDatabase.create(groupMasterKey, decryptedGroup);
         Log.i(TAG, "Created local group with placeholder");

app/src/main/java/org/thoughtcrime/securesms/groups/v2/processing/GroupsV2StateProcessor.java

@@ -19,6 +19,7 @@ import org.signal.storageservice.protos.groups.local.DecryptedGroupChange;
 import org.signal.storageservice.protos.groups.local.DecryptedMember;
 import org.signal.storageservice.protos.groups.local.DecryptedPendingMember;
 import org.signal.storageservice.protos.groups.local.DecryptedPendingMemberRemoval;
+import org.signal.storageservice.protos.groups.local.DecryptedRequestingMember;
 import org.thoughtcrime.securesms.database.GroupTable;
 import org.thoughtcrime.securesms.database.model.GroupRecord;
 import org.thoughtcrime.securesms.database.MessageTable;
@@ -333,7 +334,14 @@ public class GroupsV2StateProcessor {
                                                       .filter(Objects::nonNull)
                                                       .anyMatch(serviceIds::matches);
 
-      return !currentlyInGroup && !addedAsMember && !addedAsPendingMember;
+      boolean addedAsRequestingMember = signedGroupChange.getNewRequestingMembersList()
+                                                         .stream()
+                                                         .map(DecryptedRequestingMember::getUuid)
+                                                         .map(UuidUtil::fromByteStringOrNull)
+                                                         .filter(Objects::nonNull)
+                                                         .anyMatch(serviceIds::matches);
+
+      return !currentlyInGroup && !addedAsMember && !addedAsPendingMember && !addedAsRequestingMember;
     }
 
     private boolean notHavingInviteRevoked(@NonNull DecryptedGroupChange signedGroupChange) {