Soft delete group threads

Signal/src/ViewControllers/HomeView/HomeViewController.m

@@ -1137,6 +1137,14 @@ NSString *const kArchivedConversationsReuseIdentifier = @"kArchivedConversations
 - (void)deleteThread:(TSThread *)thread
 {
     [self.editingDbConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
+        if ([thread isKindOfClass:[TSGroupThread class]]) {
+            TSGroupThread *groupThread = (TSGroupThread *)thread;
+            if (groupThread.isLocalUserInGroup) {
+                [groupThread softDeleteGroupThreadWithTransaction:transaction];
+                return;
+            }
+        }
+
         [thread removeWithTransaction:transaction];
     }];
 

SignalServiceKit/src/Contacts/Threads/TSGroupThread.h

@@ -31,6 +31,8 @@ extern NSString *const TSGroupThread_NotificationKey_UniqueId;
 
 + (NSString *)defaultGroupName;
 
+- (BOOL)isLocalUserInGroup;
+
 // all group threads containing recipient as a member
 + (NSArray<TSGroupThread *> *)groupThreadsWithRecipientId:(NSString *)recipientId
                                               transaction:(YapDatabaseReadWriteTransaction *)transaction;
@@ -38,6 +40,10 @@ extern NSString *const TSGroupThread_NotificationKey_UniqueId;
 - (void)leaveGroupWithSneakyTransaction;
 - (void)leaveGroupWithTransaction:(YapDatabaseReadWriteTransaction *)transaction;
 
+- (void)softDeleteGroupThreadWithTransaction:(YapDatabaseReadWriteTransaction *)transaction;
+
+#pragma mark - Avatar
+
 - (void)updateAvatarWithAttachmentStream:(TSAttachmentStream *)attachmentStream;
 - (void)updateAvatarWithAttachmentStream:(TSAttachmentStream *)attachmentStream
                              transaction:(YapDatabaseReadWriteTransaction *)transaction;

SignalServiceKit/src/Contacts/Threads/TSGroupThread.m

@@ -173,6 +173,11 @@ NSString *const TSGroupThread_NotificationKey_UniqueId = @"TSGroupThread_Notific
     return true;
 }
 
+- (BOOL)isLocalUserInGroup
+{
+    return [self.groupModel.groupMemberIds containsObject:TSAccountManager.localNumber];
+}
+
 - (NSString *)name
 {
     // TODO sometimes groupName is set to the empty string. I'm hesitent to change
@@ -203,6 +208,13 @@ NSString *const TSGroupThread_NotificationKey_UniqueId = @"TSGroupThread_Notific
     [self saveWithTransaction:transaction];
 }
 
+- (void)softDeleteGroupThreadWithTransaction:(YapDatabaseReadWriteTransaction *)transaction
+{
+    [self removeAllThreadInteractionsWithTransaction:transaction];
+    self.shouldThreadBeVisible = NO;
+    [self saveWithTransaction:transaction];
+}
+
 #pragma mark - Avatar
 
 - (void)updateAvatarWithAttachmentStream:(TSAttachmentStream *)attachmentStream

SignalServiceKit/src/Storage/TSDatabaseView.m

@@ -202,9 +202,7 @@ NSString *const TSLazyRestoreAttachmentsGroup = @"TSLazyRestoreAttachmentsGroup"
         }
         TSThread *thread = (TSThread *)object;
 
-        if (thread.isGroupThread) {
-            // Do nothing; we never hide group threads.
-        } else if (thread.shouldThreadBeVisible) {
+        if (thread.shouldThreadBeVisible) {
             // Do nothing; we never hide threads that have ever had a message.
         } else {
             YapDatabaseViewTransaction *viewTransaction = [transaction ext:TSMessageDatabaseViewExtensionName];
@@ -232,7 +230,7 @@ NSString *const TSLazyRestoreAttachmentsGroup = @"TSLazyRestoreAttachmentsGroup"
         [[YapWhitelistBlacklist alloc] initWithWhitelist:[NSSet setWithObject:[TSThread collection]]];
 
     YapDatabaseView *databaseView =
-        [[YapDatabaseAutoView alloc] initWithGrouping:viewGrouping sorting:viewSorting versionTag:@"3" options:options];
+        [[YapDatabaseAutoView alloc] initWithGrouping:viewGrouping sorting:viewSorting versionTag:@"4" options:options];
 
     [storage asyncRegisterExtension:databaseView withName:TSThreadDatabaseViewExtensionName];
 }