Skip animations in conversation view.

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -2963,8 +2963,6 @@ typedef NS_ENUM(NSInteger, MessagesRangeSizeMode) {
     if (shouldAnimateUpdates) {
         [self.collectionView performBatchUpdates:batchUpdates completion:batchUpdatesCompletion];
     } else {
-        // We want these animations to be as short as possible, but `performBatchUpdates`
-        // will SIGABORT in some cases if the animation duration is zero.
         [UIView performWithoutAnimation:^{
             [self.collectionView performBatchUpdates:batchUpdates completion:batchUpdatesCompletion];
         }];