Don't show mutual groups for deleted threads

Author: Imperiopolis

Signal/src/ViewControllers/ConversationView/CV/CVComponents/CVComponentThreadDetails.swift

@@ -189,7 +189,7 @@ public class CVComponentThreadDetails: CVComponentBase, CVRootComponent {
             }
 
             let groupThreads = TSGroupThread.groupThreads(with: contactThread.contactAddress, transaction: transaction)
-            let mutualGroupNames = groupThreads.map { $0.groupNameOrDefault }
+            let mutualGroupNames = groupThreads.filter { $0.isLocalUserFullMember && $0.shouldThreadBeVisible }.map { $0.groupNameOrDefault }
 
             let formatString: String
             var groupsToInsert = mutualGroupNames

SignalServiceKit/src/Contacts/Threads/TSGroupThread.m

@@ -139,9 +139,7 @@ + (nullable instancetype)fetchWithGroupId:(NSData *)groupId transaction:(SDSAnyR
                                     block:^(TSThread *thread, BOOL *stop) {
                                         if ([thread isKindOfClass:[TSGroupThread class]]) {
                                             TSGroupThread *groupThread = (TSGroupThread *)thread;
-                                            if ([groupThread.groupModel.groupMembership.fullMembers
-                                                    containsObject:address]
-                                                && groupThread.isLocalUserFullMember) {
+                                            if ([groupThread.groupModel.groupMembers containsObject:address]) {
                                                 [groupThreads addObject:groupThread];
                                             }
                                         }