Landscape layout in gif picker.

Signal/src/ViewControllers/GifPicker/GifPickerLayout.swift

@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2019 Open Whisper Systems. All rights reserved.
 //
 
 import Foundation
@@ -60,9 +60,7 @@ class GifPickerLayout: UICollectionViewLayout {
         // We  use 2 or 3 columns, depending on the device.
         // 2 columns will show fewer GIFs at a time,
         // but use less network & be a more responsive experience.
-        let screenSize = UIScreen.main.bounds.size
-        let screenWidth = min(screenSize.width, screenSize.height)
-        let columnCount = UInt(max(2, screenWidth / 130))
+        let columnCount = UInt(max(2, collectionView.width() / 130))
 
         let totalViewWidth = UInt(collectionView.width())
         let hTotalWhitespace = (2 * hInset) + (hSpacing * (columnCount - 1))

Signal/src/ViewControllers/GifPicker/GifPickerViewController.swift

@@ -518,4 +518,10 @@ class GifPickerViewController: OWSViewController, UISearchBarDelegate, UICollect
         }
         tryToSearch()
     }
+
+    public override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
+        super.traitCollectionDidChange(previousTraitCollection)
+
+        layout.invalidateLayout()
+    }
 }

SignalMessaging/utils/OWSWindowManager.m

@@ -490,7 +490,7 @@ const UIWindowLevel UIWindowLevel_MessageActions(void)
         OWSLogInfo(@"showing root window.");
     }
 
-    // By calling makeKeyAndVisible we ensure the rootViewController becomes firt responder.
+    // By calling makeKeyAndVisible we ensure the rootViewController becomes first responder.
     // In the normal case, that means the SignalViewController will call `becomeFirstResponder`
     // on the vc on top of its navigation stack.
     [self.rootWindow makeKeyAndVisible];