From 104a548eb2f32b0f494910dbf920b8b30efa431c Mon Sep 17 00:00:00 2001
From: Matthew Chen <charlesmchen@gmail.com>
Date: Fri, 16 Jun 2017 17:35:25 -0400
Subject: [PATCH] Ensure message mapping is up-to-date when app returns from
 background.

// FREEBIE
---
 .../ConversationView/MessagesViewController.m              | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Signal/src/ViewControllers/ConversationView/MessagesViewController.m b/Signal/src/ViewControllers/ConversationView/MessagesViewController.m
index f7c0c053d7..42cda74c61 100644
--- a/Signal/src/ViewControllers/ConversationView/MessagesViewController.m
+++ b/Signal/src/ViewControllers/ConversationView/MessagesViewController.m
@@ -561,6 +561,13 @@ typedef enum : NSUInteger {
     // or on another device.
     [self hideInputIfNeeded];
 
+    // We need to `beginLongLivedReadTransaction` before we update our
+    // mapping in order to jump to the most recent commit.
+    [self.uiDatabaseConnection beginLongLivedReadTransaction];
+    [self.uiDatabaseConnection readWithBlock:^(YapDatabaseReadTransaction *transaction) {
+        [self.messageMappings updateWithTransaction:transaction];
+    }];
+
     [self toggleObservers:YES];
 
     // restart any animations that were stopped e.g. while inspecting the contact info screens.