Changes suggested by code review. Added iPhone 4 screen size to iPhoneX test so Signal doesn't blow up in iPad's iPhone compatibility mode.

Signal/src/ViewControllers/HomeView/HomeViewController.m

@@ -220,10 +220,13 @@ NSString *const kArchivedConversationsReuseIdentifier = @"kArchivedConversations
     UILabel *emptyBoxLabel = [UILabel new];
     self.emptyBoxLabel = emptyBoxLabel;
     [self.view addSubview:emptyBoxLabel];
-    [emptyBoxLabel setNumberOfLines:0]; //  Let the label use as many lines as needed. It will very rarely be more than 2.
+
+    //  Let the label use as many lines as needed. It will very rarely be more than 2 but may happen for verbose locs.
+    [emptyBoxLabel setNumberOfLines:0];
+
     [emptyBoxLabel autoPinLeadingToSuperviewMargin];
     [emptyBoxLabel autoPinTrailingToSuperviewMargin];
-    [[[emptyBoxLabel centerYAnchor] constraintEqualToAnchor:[[self view] centerYAnchor]] setActive:YES];
+    [emptyBoxLabel autoPinVCenterToSuperviewVCenter];
 
     UIRefreshControl *pullToRefreshView = [UIRefreshControl new];
     pullToRefreshView.tintColor = [UIColor grayColor];

SignalMessaging/categories/UIDevice+featureSupport.swift

@@ -13,6 +13,9 @@ public extension UIDevice {
     @objc
     public var isIPhoneX: Bool {
         switch UIScreen.main.nativeBounds.height {
+        case 960:
+            //  iPad in iPhone compatibility mode (using old iPhone 4 screen size)
+            return false
         case 1136:
             // iPhone 5 or 5S or 5C
             return false

SignalMessaging/categories/UIView+OWS.h

@@ -88,6 +88,7 @@ CGFloat ScaleFromIPhone5(CGFloat iPhone5Value);
 - (NSLayoutConstraint *)autoPinTopToSuperviewMarginWithInset:(CGFloat)margin;
 - (NSLayoutConstraint *)autoPinBottomToSuperviewMargin;
 - (NSLayoutConstraint *)autoPinBottomToSuperviewMarginWithInset:(CGFloat)margin;
+- (NSLayoutConstraint *)autoPinVCenterToSuperviewVCenter;
 
 - (NSLayoutConstraint *)autoPinLeadingToTrailingEdgeOfView:(UIView *)view;
 - (NSLayoutConstraint *)autoPinLeadingToTrailingEdgeOfView:(UIView *)view offset:(CGFloat)margin;

SignalMessaging/categories/UIView+OWS.m

@@ -302,6 +302,14 @@ CGFloat ScaleFromIPhone5(CGFloat iPhone5Value)
     return constraint;
 }
 
+- (NSLayoutConstraint *)autoPinVCenterToSuperviewVCenter {
+    self.translatesAutoresizingMaskIntoConstraints = NO;
+
+    NSLayoutConstraint *constraint = [self.centerYAnchor constraintEqualToAnchor:self.superview.centerYAnchor];
+    constraint.active = YES;
+    return constraint;
+}
+
 - (NSLayoutConstraint *)autoPinTopToSuperviewMargin
 {
     return [self autoPinTopToSuperviewMarginWithInset:0.f];