From 3c3742aae9795c0fc1e525cf64ea71e1c020e892 Mon Sep 17 00:00:00 2001
From: Matthew Chen <matthew@signal.org>
Date: Tue, 17 Jul 2018 11:40:34 -0400
Subject: [PATCH] Clean up ahead of PR.

---
 SignalMessaging/contacts/OWSContactsManager.m | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/SignalMessaging/contacts/OWSContactsManager.m b/SignalMessaging/contacts/OWSContactsManager.m
index 4a9869b33..cc973ca4c 100644
--- a/SignalMessaging/contacts/OWSContactsManager.m
+++ b/SignalMessaging/contacts/OWSContactsManager.m
@@ -281,6 +281,9 @@ NSString *const OWSContactsManagerKeyNextFullIntersectionDate = @"OWSContactsMan
             recipientIdsForIntersection = allContactRecipientIds;
 
             if (!isFullIntersection) {
+                // Do a "delta" intersection instead of a "full" intersection:
+                // only intersect new contacts which were not in the last successful
+                // "full" intersection.
                 NSSet<NSString *> *_Nullable lastKnownContactPhoneNumbers =
                     [transaction objectForKey:OWSContactsManagerKeyLastKnownContactPhoneNumbers
                                  inCollection:OWSContactsManagerCollection];