“Add to contacts” offer.

// FREEBIE

Signal/src/ViewControllers/MessagesViewController.m

@@ -747,6 +747,10 @@ typedef enum : NSUInteger {
     _composeOnOpen = keyboardOnViewAppearing;
     _callOnOpen = callOnViewAppearing;
 
+    // We need to create the "unread indicator" before we mark
+    // all messages as read.
+    [self ensureThreadOffersAndIndicators];
+
     [self markAllMessagesAsRead];
 
     [self.uiDatabaseConnection beginLongLivedReadTransaction];
@@ -2752,9 +2756,8 @@ typedef enum : NSUInteger {
     OWSAssert([NSThread isMainThread]);
 
     if (self.hasClearedUnreadMessagesIndicator) {
-        // ensureThreadOffersAndIndicators is slightly
+        // ensureThreadOffersAndIndicators is somewhat expensive
-        // expensive, so make sure we don't call it
+        // so we don't want to call it unnecessarily.
-        // unneccesarily.
         return;
     }
 

Signal/src/util/ThreadUtil.m

@@ -103,7 +103,7 @@ NS_ASSUME_NONNULL_BEGIN
         __block TSUnreadIndicatorInteraction *unreadIndicator = nil;
         __block TSIncomingMessage *firstIncomingMessage = nil;
         __block TSOutgoingMessage *firstOutgoingMessage = nil;
-        __block TSMessage *firstUnreadMessage = nil;
+        __block TSIncomingMessage *firstUnreadMessage = nil;
         __block long outgoingMessageCount = 0;
 
         [[transaction ext:TSMessageDatabaseViewExtensionName]