Skip animations in conversation view.

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -2965,10 +2965,9 @@ typedef NS_ENUM(NSInteger, MessagesRangeSizeMode) {
     } else {
         // We want these animations to be as short as possible, but `performBatchUpdates`
         // will SIGABORT in some cases if the animation duration is zero.
-        [CATransaction begin];
+        [UIView performWithoutAnimation:^{
-        [CATransaction setAnimationDuration:0.001f];
+            [self.collectionView performBatchUpdates:batchUpdates completion:batchUpdatesCompletion];
-        [self.collectionView performBatchUpdates:batchUpdates completion:batchUpdatesCompletion];
+        }];
-        [CATransaction commit];
     }
 }