Improve handling of membership changes during a GV1->GV2 migration.

app/src/main/java/org/thoughtcrime/securesms/BindableConversationItem.java

@@ -14,6 +14,7 @@ import org.thoughtcrime.securesms.conversation.ConversationMessage;
 import org.thoughtcrime.securesms.database.model.MessageRecord;
 import org.thoughtcrime.securesms.database.model.MmsMessageRecord;
 import org.thoughtcrime.securesms.groups.GroupId;
+import org.thoughtcrime.securesms.groups.GroupMigrationMembershipChange;
 import org.thoughtcrime.securesms.linkpreview.LinkPreview;
 import org.thoughtcrime.securesms.mms.GlideRequests;
 import org.thoughtcrime.securesms.recipients.Recipient;
@@ -59,7 +60,7 @@ public interface BindableConversationItem extends Unbindable {
     void onVoiceNotePause(@NonNull Uri uri);
     void onVoiceNotePlay(@NonNull Uri uri, long messageId, double position);
     void onVoiceNoteSeekTo(@NonNull Uri uri, double position);
-    void onGroupMigrationLearnMoreClicked(@NonNull List<RecipientId> pendingRecipients);
+    void onGroupMigrationLearnMoreClicked(@NonNull GroupMigrationMembershipChange membershipChange);
     void onJoinGroupCallClicked();
 
     /** @return true if handled, false if you want to let the normal url handling continue */

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationFragment.java

@@ -89,6 +89,7 @@ import org.thoughtcrime.securesms.database.model.MessageRecord;
 import org.thoughtcrime.securesms.database.model.MmsMessageRecord;
 import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
 import org.thoughtcrime.securesms.groups.GroupId;
+import org.thoughtcrime.securesms.groups.GroupMigrationMembershipChange;
 import org.thoughtcrime.securesms.groups.ui.migration.GroupsV1MigrationInfoBottomSheetDialogFragment;
 import org.thoughtcrime.securesms.jobs.DirectoryRefreshJob;
 import org.thoughtcrime.securesms.jobs.MultiDeviceViewOnceOpenJob;
@@ -1416,8 +1417,8 @@ public class ConversationFragment extends LoggingFragment {
     }
 
     @Override
-    public void onGroupMigrationLearnMoreClicked(@NonNull List<RecipientId> pendingRecipients) {
+    public void onGroupMigrationLearnMoreClicked(@NonNull GroupMigrationMembershipChange membershipChange) {
-      GroupsV1MigrationInfoBottomSheetDialogFragment.showForLearnMore(requireFragmentManager(), pendingRecipients);
+      GroupsV1MigrationInfoBottomSheetDialogFragment.show(requireFragmentManager(), membershipChange);
     }
 
     @Override

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationUpdateItem.java

@@ -178,7 +178,7 @@ public final class ConversationUpdateItem extends LinearLayout
       actionButton.setVisibility(VISIBLE);
       actionButton.setOnClickListener(v -> {
         if (batchSelected.isEmpty() && eventListener != null) {
-          eventListener.onGroupMigrationLearnMoreClicked(conversationMessage.getMessageRecord().getGroupV1MigrationEventInvites());
+          eventListener.onGroupMigrationLearnMoreClicked(conversationMessage.getMessageRecord().getGroupV1MigrationMembershipChanges());
         }
       });
     } else if (conversationMessage.getMessageRecord().isGroupCall()) {

app/src/main/java/org/thoughtcrime/securesms/database/GroupDatabase.java

@@ -24,11 +24,13 @@ import org.signal.zkgroup.groups.GroupMasterKey;
 import org.thoughtcrime.securesms.database.helpers.SQLCipherOpenHelper;
 import org.thoughtcrime.securesms.groups.GroupAccessControl;
 import org.thoughtcrime.securesms.groups.GroupId;
+import org.thoughtcrime.securesms.groups.GroupMigrationMembershipChange;
 import org.thoughtcrime.securesms.logging.Log;
 import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.recipients.RecipientId;
 import org.thoughtcrime.securesms.tracing.Trace;
 import org.thoughtcrime.securesms.util.CursorUtil;
+import org.thoughtcrime.securesms.util.SetUtil;
 import org.thoughtcrime.securesms.util.SqlUtil;
 import org.thoughtcrime.securesms.util.Util;
 import org.whispersystems.libsignal.util.guava.Optional;
@@ -486,11 +488,12 @@ public final class GroupDatabase extends Database {
    * Migrates a V1 group to a V2 group.
    *
    * @param decryptedGroup The state that represents the group on the server. This will be used to
-   *                       determine if we need to save our old membership list and stuff. It will
+   *                       determine if we need to save our old membership list and stuff.
-   *                       *not* be stored as the definitive group state as-is. In order to ensure
-   *                       proper diffing, we modify this model to have our V1 membership.
    */
-  public @NonNull GroupId.V2 migrateToV2(@NonNull GroupId.V1 groupIdV1, @NonNull DecryptedGroup decryptedGroup) {
+  public @NonNull GroupId.V2 migrateToV2(long threadId,
+                                         @NonNull GroupId.V1 groupIdV1,
+                                         @NonNull DecryptedGroup decryptedGroup)
+  {
     SQLiteDatabase db             = databaseHelper.getWritableDatabase();
     GroupId.V2     groupIdV2      = groupIdV1.deriveV2MigrationGroupId();
     GroupMasterKey groupMasterKey = groupIdV1.deriveV2MigrationMasterKey();
@@ -505,9 +508,12 @@ public final class GroupDatabase extends Database {
       contentValues.putNull(EXPECTED_V2_ID);
 
       List<RecipientId> newMembers     = Stream.of(DecryptedGroupUtil.membersToUuidList(decryptedGroup.getMembersList())).map(u -> RecipientId.from(u, null)).toList();
-      newMembers.addAll(Stream.of(DecryptedGroupUtil.pendingToUuidList(decryptedGroup.getPendingMembersList())).map(u -> RecipientId.from(u, null)).toList());
+      List<RecipientId> pendingMembers = Stream.of(DecryptedGroupUtil.pendingToUuidList(decryptedGroup.getPendingMembersList())).map(u -> RecipientId.from(u, null)).toList();
+      List<RecipientId> droppedMembers = new ArrayList<>(SetUtil.difference(record.getMembers(), newMembers));
 
-      if (record.getMembers().size() > newMembers.size() || !newMembers.containsAll(record.getMembers())) {
+      newMembers.addAll(pendingMembers);
+
+      if (droppedMembers.size() > 0) {
         contentValues.put(FORMER_V1_MEMBERS, RecipientId.toSerializedList(record.getMembers()));
       }
 
@@ -519,7 +525,11 @@ public final class GroupDatabase extends Database {
 
       DatabaseFactory.getRecipientDatabase(context).updateGroupId(groupIdV1, groupIdV2);
 
-      update(groupMasterKey, updateToHaveV1Membership(decryptedGroup, record.getMembers()));
+      update(groupMasterKey, decryptedGroup);
+
+      DatabaseFactory.getSmsDatabase(context).insertGroupV1MigrationEvents(record.getRecipientId(),
+                                                                           threadId,
+                                                                           new GroupMigrationMembershipChange(pendingMembers, droppedMembers));
 
       db.setTransactionSuccessful();
     } finally {
@@ -529,23 +539,6 @@ public final class GroupDatabase extends Database {
     return groupIdV2;
   }
 
-  private static DecryptedGroup updateToHaveV1Membership(@NonNull DecryptedGroup serverGroup, @NonNull List<RecipientId> v1Members) {
-    DecryptedGroup.Builder builder = serverGroup.toBuilder();
-    builder.clearMembers();
-
-    for (RecipientId v1MemberId : v1Members) {
-      Recipient v1Member = Recipient.resolved(v1MemberId);
-      if (v1Member.hasUuid()) {
-        builder.addMembers(DecryptedMember.newBuilder()
-                                          .setUuid(UuidUtil.toByteString(v1Member.getUuid().get()))
-                                          .setRole(Member.Role.ADMINISTRATOR)
-                                          .build());
-      }
-    }
-
-    return builder.build();
-  }
-
   public void update(@NonNull GroupMasterKey groupMasterKey, @NonNull DecryptedGroup decryptedGroup) {
     update(GroupId.v2(groupMasterKey), decryptedGroup);
   }

app/src/main/java/org/thoughtcrime/securesms/database/MessageDatabase.java

@@ -24,6 +24,7 @@ import org.thoughtcrime.securesms.database.model.MessageRecord;
 import org.thoughtcrime.securesms.database.model.ReactionRecord;
 import org.thoughtcrime.securesms.database.model.SmsMessageRecord;
 import org.thoughtcrime.securesms.database.model.databaseprotos.ReactionList;
+import org.thoughtcrime.securesms.groups.GroupMigrationMembershipChange;
 import org.thoughtcrime.securesms.insights.InsightsConstants;
 import org.thoughtcrime.securesms.logging.Log;
 import org.thoughtcrime.securesms.mms.IncomingMediaMessage;
@@ -148,7 +149,7 @@ public abstract class MessageDatabase extends Database implements MmsSmsColumns
   public abstract long insertMessageOutbox(@NonNull OutgoingMediaMessage message, long threadId, boolean forceSms, @Nullable SmsDatabase.InsertListener insertListener) throws MmsException;
   public abstract long insertMessageOutbox(@NonNull OutgoingMediaMessage message, long threadId, boolean forceSms, int defaultReceiptStatus, @Nullable SmsDatabase.InsertListener insertListener) throws MmsException;
   public abstract void insertProfileNameChangeMessages(@NonNull Recipient recipient, @NonNull String newProfileName, @NonNull String previousProfileName);
-  public abstract void insertGroupV1MigrationEvents(@NonNull RecipientId recipientId, long threadId, List<RecipientId> pendingRecipients);
+  public abstract void insertGroupV1MigrationEvents(@NonNull RecipientId recipientId, long threadId, @NonNull GroupMigrationMembershipChange membershipChange);
 
   public abstract boolean deleteMessage(long messageId);
   abstract void deleteThread(long threadId);

app/src/main/java/org/thoughtcrime/securesms/database/MmsDatabase.java

@@ -54,6 +54,7 @@ import org.thoughtcrime.securesms.database.model.ReactionRecord;
 import org.thoughtcrime.securesms.database.model.SmsMessageRecord;
 import org.thoughtcrime.securesms.database.model.databaseprotos.BodyRangeList;
 import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
+import org.thoughtcrime.securesms.groups.GroupMigrationMembershipChange;
 import org.thoughtcrime.securesms.jobs.TrimThreadJob;
 import org.thoughtcrime.securesms.linkpreview.LinkPreview;
 import org.thoughtcrime.securesms.logging.Log;
@@ -494,7 +495,10 @@ public class MmsDatabase extends MessageDatabase {
   }
 
   @Override
-  public void insertGroupV1MigrationEvents(@NonNull RecipientId recipientId, long threadId, List<RecipientId> pendingRecipients) {
+  public void insertGroupV1MigrationEvents(@NonNull RecipientId recipientId,
+                                           long threadId,
+                                           @NonNull GroupMigrationMembershipChange membershipChange)
+  {
     throw new UnsupportedOperationException();
   }
 

app/src/main/java/org/thoughtcrime/securesms/database/SmsDatabase.java

@@ -42,6 +42,7 @@ import org.thoughtcrime.securesms.database.model.SmsMessageRecord;
 import org.thoughtcrime.securesms.database.model.databaseprotos.GroupCallUpdateDetails;
 import org.thoughtcrime.securesms.database.model.databaseprotos.ProfileChangeDetails;
 import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
+import org.thoughtcrime.securesms.groups.GroupMigrationMembershipChange;
 import org.thoughtcrime.securesms.jobs.TrimThreadJob;
 import org.thoughtcrime.securesms.logging.Log;
 import org.thoughtcrime.securesms.mms.IncomingMediaMessage;
@@ -72,7 +73,6 @@ import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-import java.util.Objects;
 import java.util.Set;
 import java.util.UUID;
 
@@ -862,11 +862,14 @@ public class SmsDatabase extends MessageDatabase {
   }
 
   @Override
-  public void insertGroupV1MigrationEvents(@NonNull RecipientId recipientId, long threadId, @NonNull List<RecipientId> pendingRecipients) {
+  public void insertGroupV1MigrationEvents(@NonNull RecipientId recipientId,
+                                           long threadId,
+                                           @NonNull GroupMigrationMembershipChange membershipChange)
+  {
     insertGroupV1MigrationNotification(recipientId, threadId);
 
-    if (pendingRecipients.size() > 0) {
+    if (!membershipChange.isEmpty()) {
-      insertGroupV1MigrationEvent(recipientId, threadId, pendingRecipients);
+      insertGroupV1MigrationMembershipChanges(recipientId, threadId, membershipChange);
     }
 
     notifyConversationListeners(threadId);
@@ -874,10 +877,13 @@ public class SmsDatabase extends MessageDatabase {
   }
 
   private void insertGroupV1MigrationNotification(@NonNull RecipientId recipientId, long threadId) {
-    insertGroupV1MigrationEvent(recipientId, threadId, Collections.emptyList());
+    insertGroupV1MigrationMembershipChanges(recipientId, threadId, GroupMigrationMembershipChange.empty());
   }
 
-  private void insertGroupV1MigrationEvent(@NonNull RecipientId recipientId, long threadId, @NonNull List<RecipientId> pendingRecipients) {
+  private void insertGroupV1MigrationMembershipChanges(@NonNull RecipientId recipientId,
+                                                       long threadId,
+                                                       @NonNull GroupMigrationMembershipChange membershipChange)
+  {
     ContentValues values = new ContentValues();
     values.put(RECIPIENT_ID, recipientId.serialize());
     values.put(ADDRESS_DEVICE_ID, 1);
@@ -887,8 +893,8 @@ public class SmsDatabase extends MessageDatabase {
     values.put(TYPE, Types.GV1_MIGRATION_TYPE);
     values.put(THREAD_ID, threadId);
 
-    if (pendingRecipients.size() > 0) {
+    if (!membershipChange.isEmpty()) {
-      values.put(BODY, RecipientId.toSerializedList(pendingRecipients));
+      values.put(BODY, membershipChange.serialize());
     }
 
     databaseHelper.getWritableDatabase().insert(TABLE_NAME, null, values);

app/src/main/java/org/thoughtcrime/securesms/database/model/MessageRecord.java

@@ -39,6 +39,7 @@ import org.thoughtcrime.securesms.database.documents.NetworkFailure;
 import org.thoughtcrime.securesms.database.model.databaseprotos.DecryptedGroupV2Context;
 import org.thoughtcrime.securesms.database.model.databaseprotos.GroupCallUpdateDetails;
 import org.thoughtcrime.securesms.database.model.databaseprotos.ProfileChangeDetails;
+import org.thoughtcrime.securesms.groups.GroupMigrationMembershipChange;
 import org.thoughtcrime.securesms.logging.Log;
 import org.thoughtcrime.securesms.profiles.ProfileName;
 import org.thoughtcrime.securesms.recipients.Recipient;
@@ -54,6 +55,7 @@ import org.whispersystems.signalservice.api.groupsv2.DecryptedGroupUtil;
 import org.whispersystems.signalservice.api.util.UuidUtil;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
@@ -186,12 +188,7 @@ public abstract class MessageRecord extends DisplayRecord {
       if (isOutgoing()) return staticUpdateDescription(context.getString(R.string.SmsMessageRecord_secure_session_reset), R.drawable.ic_update_info_16);
       else              return fromRecipient(getIndividualRecipient(), r-> context.getString(R.string.SmsMessageRecord_secure_session_reset_s, r.getDisplayName(context)), R.drawable.ic_update_info_16);
     } else if (isGroupV1MigrationEvent()) {
-      if (Util.isEmpty(getBody())) {
+      return getGroupMigrationEventDescription(context);
-        return staticUpdateDescription(context.getString(R.string.MessageRecord_this_group_was_updated_to_a_new_group), R.drawable.ic_update_group_role_16);
-      } else {
-        int count = getGroupV1MigrationEventInvites().size();
-        return staticUpdateDescription(context.getResources().getQuantityString(R.plurals.MessageRecord_members_couldnt_be_added_to_the_new_group_and_have_been_invited, count, count), R.drawable.ic_update_group_add_16);
-      }
     }
 
     return null;
@@ -288,6 +285,30 @@ public abstract class MessageRecord extends DisplayRecord {
     return context.getString(R.string.MessageRecord_changed_their_profile, getIndividualRecipient().getDisplayName(context));
   }
 
+  private UpdateDescription getGroupMigrationEventDescription(@NonNull Context context) {
+    if (Util.isEmpty(getBody())) {
+      return staticUpdateDescription(context.getString(R.string.MessageRecord_this_group_was_updated_to_a_new_group), R.drawable.ic_update_group_role_16);
+    } else {
+      GroupMigrationMembershipChange change  = getGroupV1MigrationMembershipChanges();
+      List<UpdateDescription>        updates = new ArrayList<>(2);
+
+      if (change.getPending().size() == 1 && change.getPending().get(0).equals(Recipient.self().getId())) {
+        updates.add(staticUpdateDescription(context.getString(R.string.MessageRecord_you_couldnt_be_added_to_the_new_group_and_have_been_invited_to_join), R.drawable.ic_update_group_add_16));
+      } else if (change.getPending().size() > 0) {
+        int count = change.getPending().size();
+        updates.add(staticUpdateDescription(context.getResources().getQuantityString(R.plurals.MessageRecord_members_couldnt_be_added_to_the_new_group_and_have_been_invited, count, count), R.drawable.ic_update_group_add_16));
+      }
+
+      if (change.getDropped().size() > 0) {
+        int count = change.getDropped().size();
+        updates.add(staticUpdateDescription(context.getResources().getQuantityString(R.plurals.MessageRecord_members_couldnt_be_added_to_the_new_group_and_have_been_removed, count, count), R.drawable.ic_update_group_remove_16));
+      }
+
+      return UpdateDescription.concatWithNewLines(updates);
+    }
+  }
+
+
   public static @NonNull UpdateDescription getGroupCallUpdateDescription(@NonNull Context context, @NonNull String body) {
     GroupCallUpdateDetails groupCallUpdateDetails = GroupCallUpdateDetailsUtil.parse(body);
 
@@ -380,11 +401,11 @@ public abstract class MessageRecord extends DisplayRecord {
     return SmsDatabase.Types.isGroupV1MigrationEvent(type);
   }
 
-  public @NonNull List<RecipientId> getGroupV1MigrationEventInvites() {
+  public @NonNull GroupMigrationMembershipChange getGroupV1MigrationMembershipChanges() {
     if (isGroupV1MigrationEvent()) {
-      return RecipientId.fromSerializedList(getBody());
+      return GroupMigrationMembershipChange.deserialize(getBody());
     } else {
-      return Collections.emptyList();
+      return GroupMigrationMembershipChange.empty();
     }
   }
 

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

@@ -0,0 +1,60 @@
+package org.thoughtcrime.securesms.groups;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import org.thoughtcrime.securesms.database.model.MessageRecord;
+import org.thoughtcrime.securesms.recipients.RecipientId;
+import org.thoughtcrime.securesms.util.StringUtil;
+import org.thoughtcrime.securesms.util.Util;
+
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Describes a change in membership that results from a GV1->GV2 migration.
+ */
+public final class GroupMigrationMembershipChange {
+  private final List<RecipientId> pending;
+  private final List<RecipientId> dropped;
+
+  public GroupMigrationMembershipChange(@NonNull List<RecipientId> pending, @NonNull List<RecipientId> dropped) {
+    this.pending = pending;
+    this.dropped = dropped;
+  }
+
+  public static GroupMigrationMembershipChange empty() {
+    return new GroupMigrationMembershipChange(Collections.emptyList(), Collections.emptyList());
+  }
+
+  public static @NonNull GroupMigrationMembershipChange deserialize(@Nullable String serialized) {
+    if (Util.isEmpty(serialized)) {
+      return empty();
+    } else {
+      String[] parts = serialized.split("\\|");
+      if (parts.length == 1) {
+        return new GroupMigrationMembershipChange(RecipientId.fromSerializedList(parts[0]), Collections.emptyList());
+      } else if (parts.length == 2) {
+        return new GroupMigrationMembershipChange(RecipientId.fromSerializedList(parts[0]), RecipientId.fromSerializedList(parts[1]));
+      } else {
+        return GroupMigrationMembershipChange.empty();
+      }
+    }
+  }
+
+  public @NonNull List<RecipientId> getPending() {
+    return pending;
+  }
+
+  public @NonNull List<RecipientId> getDropped() {
+    return dropped;
+  }
+
+  public @NonNull String serialize() {
+    return RecipientId.toSerializedList(pending) + "|" + RecipientId.toSerializedList(dropped);
+  }
+
+  public boolean isEmpty() {
+    return pending.isEmpty() && dropped.isEmpty();
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/groups/GroupsV1MigrationUtil.java

@@ -26,6 +26,7 @@ import org.whispersystems.signalservice.api.groupsv2.DecryptedGroupUtil;
 
 import java.io.Closeable;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.List;
 
 import static org.thoughtcrime.securesms.groups.v2.processing.GroupsV2StateProcessor.LATEST;
@@ -182,15 +183,8 @@ public final class GroupsV1MigrationUtil {
         return null;
       }
 
-      List<RecipientId> pendingRecipients = Stream.of(DecryptedGroupUtil.pendingToUuidList(decryptedGroup.getPendingMembersList()))
-                                                  .map(uuid -> Recipient.externalPush(context, uuid, null, false))
-                                                  .filterNot(Recipient::isSelf)
-                                                  .map(Recipient::getId)
-                                                  .toList();
-
       Log.i(TAG, "[Local] Migrating group over to the version we were added to: V" + decryptedGroup.getRevision());
-      DatabaseFactory.getGroupDatabase(context).migrateToV2(gv1Id, decryptedGroup);
+      DatabaseFactory.getGroupDatabase(context).migrateToV2(threadId, gv1Id, decryptedGroup);
-      DatabaseFactory.getSmsDatabase(context).insertGroupV1MigrationEvents(groupRecipient.getId(), threadId, pendingRecipients);
 
       Log.i(TAG, "[Local] Applying all changes since V" + decryptedGroup.getRevision());
       try {

app/src/main/java/org/thoughtcrime/securesms/groups/ui/migration/GroupsV1MigrationInfoBottomSheetDialogFragment.java

@@ -15,13 +15,12 @@ import androidx.lifecycle.ViewModelProviders;
 import com.google.android.material.bottomsheet.BottomSheetDialogFragment;
 
 import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.groups.GroupMigrationMembershipChange;
 import org.thoughtcrime.securesms.groups.ui.GroupMemberListView;
 import org.thoughtcrime.securesms.recipients.Recipient;
-import org.thoughtcrime.securesms.recipients.RecipientId;
 import org.thoughtcrime.securesms.util.BottomSheetUtil;
 import org.thoughtcrime.securesms.util.ThemeUtil;
 
-import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -30,16 +29,19 @@ import java.util.List;
  */
 public final class GroupsV1MigrationInfoBottomSheetDialogFragment extends BottomSheetDialogFragment {
 
-  private static final String KEY_PENDING = "pending";
+  private static final String KEY_MEMBERSHIP_CHANGE = "membership_change";
 
   private GroupsV1MigrationInfoViewModel viewModel;
   private GroupMemberListView            pendingList;
   private TextView                       pendingTitle;
   private View                           pendingContainer;
+  private GroupMemberListView            droppedList;
+  private TextView                       droppedTitle;
+  private View                           droppedContainer;
 
-  public static void showForLearnMore(@NonNull FragmentManager manager, @NonNull List<RecipientId> pendingRecipients) {
+  public static void show(@NonNull FragmentManager manager, @NonNull GroupMigrationMembershipChange membershipChange) {
     Bundle args = new Bundle();
-    args.putParcelableArrayList(KEY_PENDING, new ArrayList<>(pendingRecipients));
+    args.putString(KEY_MEMBERSHIP_CHANGE, membershipChange.serialize());
 
     GroupsV1MigrationInfoBottomSheetDialogFragment fragment = new GroupsV1MigrationInfoBottomSheetDialogFragment();
     fragment.setArguments(args);
@@ -66,12 +68,16 @@ public final class GroupsV1MigrationInfoBottomSheetDialogFragment extends Bottom
     this.pendingContainer = view.findViewById(R.id.gv1_learn_more_pending_container);
     this.pendingTitle     = view.findViewById(R.id.gv1_learn_more_pending_title);
     this.pendingList      = view.findViewById(R.id.gv1_learn_more_pending_list);
+    this.droppedContainer = view.findViewById(R.id.gv1_learn_more_dropped_container);
+    this.droppedTitle     = view.findViewById(R.id.gv1_learn_more_dropped_title);
+    this.droppedList      = view.findViewById(R.id.gv1_learn_more_dropped_list);
 
     //noinspection ConstantConditions
-    List<RecipientId> pending = getArguments().getParcelableArrayList(KEY_PENDING);
+    GroupMigrationMembershipChange membershipChange = GroupMigrationMembershipChange.deserialize(getArguments().getString(KEY_MEMBERSHIP_CHANGE));
 
-    this.viewModel = ViewModelProviders.of(this, new GroupsV1MigrationInfoViewModel.Factory(pending)).get(GroupsV1MigrationInfoViewModel.class);
+    this.viewModel = ViewModelProviders.of(this, new GroupsV1MigrationInfoViewModel.Factory(membershipChange)).get(GroupsV1MigrationInfoViewModel.class);
     viewModel.getPendingMembers().observe(getViewLifecycleOwner(), this::onPendingMembersChanged);
+    viewModel.getDroppedMembers().observe(getViewLifecycleOwner(), this::onDroppedMembersChanged);
 
     view.findViewById(R.id.gv1_learn_more_ok_button).setOnClickListener(v -> dismiss());
   }
@@ -82,7 +88,10 @@ public final class GroupsV1MigrationInfoBottomSheetDialogFragment extends Bottom
   }
 
   private void onPendingMembersChanged(@NonNull List<Recipient> pendingMembers) {
-    if (pendingMembers.size() > 0) {
+    if (pendingMembers.size() == 1 && pendingMembers.get(0).isSelf()) {
+      pendingContainer.setVisibility(View.VISIBLE);
+      pendingTitle.setText(R.string.GroupsV1MigrationLearnMore_you_will_need_to_accept_an_invite_to_join_this_group_again);
+    } else if (pendingMembers.size() > 0) {
       pendingContainer.setVisibility(View.VISIBLE);
       pendingTitle.setText(getResources().getQuantityText(R.plurals.GroupsV1MigrationLearnMore_these_members_will_need_to_accept_an_invite, pendingMembers.size()));
       pendingList.setDisplayOnlyMembers(pendingMembers);
@@ -90,4 +99,14 @@ public final class GroupsV1MigrationInfoBottomSheetDialogFragment extends Bottom
       pendingContainer.setVisibility(View.GONE);
     }
   }
+
+  private void onDroppedMembersChanged(@NonNull List<Recipient> droppedMembers) {
+    if (droppedMembers.size() > 0) {
+      droppedContainer.setVisibility(View.VISIBLE);
+      droppedTitle.setText(getResources().getQuantityText(R.plurals.GroupsV1MigrationLearnMore_these_members_were_removed_from_the_group, droppedMembers.size()));
+      droppedList.setDisplayOnlyMembers(droppedMembers);
+    } else {
+      droppedContainer.setVisibility(View.GONE);
+    }
+  }
 }

app/src/main/java/org/thoughtcrime/securesms/groups/ui/migration/GroupsV1MigrationInfoViewModel.java

@@ -6,6 +6,7 @@ import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.ViewModel;
 import androidx.lifecycle.ViewModelProvider;
 
+import org.thoughtcrime.securesms.groups.GroupMigrationMembershipChange;
 import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.recipients.RecipientId;
 import org.thoughtcrime.securesms.util.concurrent.SignalExecutors;
@@ -15,12 +16,18 @@ import java.util.List;
 class GroupsV1MigrationInfoViewModel extends ViewModel {
 
   private final MutableLiveData<List<Recipient>> pendingMembers;
+  private final MutableLiveData<List<Recipient>> droppedMembers;
 
-  private GroupsV1MigrationInfoViewModel(@NonNull List<RecipientId> pendingMembers) {
+  private GroupsV1MigrationInfoViewModel(@NonNull GroupMigrationMembershipChange membershipChange) {
     this.pendingMembers = new MutableLiveData<>();
+    this.droppedMembers = new MutableLiveData<>();
 
     SignalExecutors.BOUNDED.execute(() -> {
-      this.pendingMembers.postValue(Recipient.resolvedList(pendingMembers));
+      this.pendingMembers.postValue(Recipient.resolvedList(membershipChange.getPending()));
+    });
+
+    SignalExecutors.BOUNDED.execute(() -> {
+      this.droppedMembers.postValue(Recipient.resolvedList(membershipChange.getDropped()));
     });
   }
 
@@ -28,17 +35,21 @@ class GroupsV1MigrationInfoViewModel extends ViewModel {
     return pendingMembers;
   }
 
+  @NonNull LiveData<List<Recipient>> getDroppedMembers() {
+    return droppedMembers;
+  }
+
   static class Factory extends ViewModelProvider.NewInstanceFactory {
 
-    private final List<RecipientId> pendingMembers;
+    private final GroupMigrationMembershipChange membershipChange;
 
-    Factory(List<RecipientId> pendingMembers) {
+    Factory(@NonNull GroupMigrationMembershipChange membershipChange) {
-      this.pendingMembers = pendingMembers;
+      this.membershipChange = membershipChange;
     }
 
     @Override
     public @NonNull<T extends ViewModel> T create(@NonNull Class<T> modelClass) {
-      return modelClass.cast(new GroupsV1MigrationInfoViewModel(pendingMembers));
+      return modelClass.cast(new GroupsV1MigrationInfoViewModel(membershipChange));
     }
   }
 }

app/src/main/res/layout/groupsv1_migration_bottom_sheet.xml

@@ -164,6 +164,7 @@
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginTop="20dp"
+                android:padding="20dp"
                 style="@style/Button.Primary"
                 android:text="@string/GroupsV1MigrationInitiation_upgrade_this_group" />
 

app/src/main/res/layout/groupsv1_migration_learn_more_bottom_sheet.xml

@@ -118,11 +118,53 @@
 
             </LinearLayout>
 
+            <LinearLayout
+                android:id="@+id/gv1_learn_more_dropped_container"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="23dp"
+                android:orientation="horizontal"
+                android:visibility="gone"
+                tools:visibility="visible">
+
+                <ImageView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="6dp"
+                    android:src="@drawable/paragraph_marker" />
+
+                <LinearLayout
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginStart="20dp"
+                    android:layout_marginEnd="14dp"
+                    android:orientation="vertical">
+
+                    <TextView
+                        android:id="@+id/gv1_learn_more_dropped_title"
+                        android:layout_height="wrap_content"
+                        android:layout_width="wrap_content"
+                        android:textAppearance="@style/TextAppearance.Signal.Body1"
+                        android:textColor="@color/signal_text_primary"
+                        tools:text="Plurized string for ineligible members." />
+
+                    <org.thoughtcrime.securesms.groups.ui.GroupMemberListView
+                        android:id="@+id/gv1_learn_more_dropped_list"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="16dp"
+                        android:layout_marginStart="-12dp" />
+
+                </LinearLayout>
+
+            </LinearLayout>
+
             <Button
                 android:id="@+id/gv1_learn_more_ok_button"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginTop="20dp"
+                android:padding="20dp"
                 style="@style/Button.Primary"
                 android:text="@android:string/ok" />
 

app/src/main/res/values/signal_styles.xml

@@ -24,10 +24,11 @@
 
     <style name="Signal.Widget.Button.Small.Primary" parent="Widget.MaterialComponents.Button.OutlinedButton">
         <item name="android:textAllCaps">false</item>
-        <item name="android:paddingTop">0dp</item>
+        <item name="android:paddingTop">6dp</item>
-        <item name="android:paddingBottom">0dp</item>
+        <item name="android:paddingBottom">7dp</item>
-        <item name="android:paddingStart">16dp</item>
+        <item name="android:paddingStart">14dp</item>
-        <item name="android:paddingEnd">16dp</item>
+        <item name="android:paddingEnd">14dp</item>
+        <item name="android:minHeight">0dp</item>
         <item name="android:textSize">13sp</item>
         <item name="android:fontFamily">sans-serif-medium</item>
         <item name="android:letterSpacing" tools:targetApi="21">0.01</item>

app/src/main/res/values/strings.xml

@@ -564,10 +564,15 @@
     <string name="GroupsV1MigrationLearnMore_what_are_new_groups">What are New Groups?</string>
     <string name="GroupsV1MigrationLearnMore_new_groups_have_features_like_mentions">New Groups have features like @mentions and group admins, and will support more features in the future.</string>
     <string name="GroupsV1MigrationLearnMore_all_message_history_and_media_has_been_kept">All message history and media has been kept from before the upgrade.</string>
+    <string name="GroupsV1MigrationLearnMore_you_will_need_to_accept_an_invite_to_join_this_group_again">You will need to accept an invite to join this group again, and will not receive group messages until you accept.</string>
     <plurals name="GroupsV1MigrationLearnMore_these_members_will_need_to_accept_an_invite">
         <item quantity="one">This member will need to accept an invite to join this group again and will not receive group messages until they accept:</item>
         <item quantity="other">These members will need to accept an invite to join this group again and will not receive group messages until they accept:</item>
     </plurals>
+    <plurals name="GroupsV1MigrationLearnMore_these_members_were_removed_from_the_group">
+        <item quantity="one">This member was removed from the group and will not be able to rejoin until they upgrade:</item>
+        <item quantity="other">These members were removed from the group and will not be able to rejoin until they upgrade:</item>
+    </plurals>
 
     <!-- GroupsV1MigrationInitiationBottomSheetDialogFragment -->
     <string name="GroupsV1MigrationInitiation_upgrade_to_new_group">Upgrade to New Group</string>
@@ -1050,11 +1055,17 @@
     <string name="MessageRecord_s_set_disappearing_message_time_to_s">%1$s set the disappearing message timer to %2$s.</string>
     <string name="MessageRecord_disappearing_message_time_set_to_s">The disappearing message timer has been set to %1$s.</string>
     <string name="MessageRecord_this_group_was_updated_to_a_new_group">This group was updated to a New Group.</string>
+    <string name="MessageRecord_you_couldnt_be_added_to_the_new_group_and_have_been_invited_to_join">You couldn\'t be added to the New Group and have been invited to join.</string>
     <plurals name="MessageRecord_members_couldnt_be_added_to_the_new_group_and_have_been_invited">
-        <item quantity="one">%1$s member couldn\'t be added to the New Group and has been invited to join.</item>
+        <item quantity="one">A member couldn\'t be added to the New Group and has been invited to join.</item>
         <item quantity="other">%1$s members couldn\'t be added to the New Group and have been invited to join.</item>
     </plurals>
 
+    <plurals name="MessageRecord_members_couldnt_be_added_to_the_new_group_and_have_been_removed">
+        <item quantity="one">A member couldn\'t be added to the New Group and has been removed.</item>
+        <item quantity="other">%1$s members couldn\'t be added to the New Group and have been removed.</item>
+    </plurals>
+
     <!-- Profile change updates -->
     <string name="MessageRecord_changed_their_profile_name_to">%1$s changed their profile name to %2$s.</string>
     <string name="MessageRecord_changed_their_profile_name_from_to">%1$s changed their profile name from %2$s to %3$s.</string>