Improve logging of conversation view exceptions.

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -3468,28 +3468,40 @@ typedef enum : NSUInteger {
         }
     };
 
-    if (shouldAnimateUpdates) {
-        [self.collectionView performBatchUpdates:batchUpdates completion:batchUpdatesCompletion];
-    } else {
-        // HACK: We use `UIView.animateWithDuration:0` rather than `UIView.performWithAnimation` to work around a UIKit
-        // Crash like:
-        //
-        //     *** Assertion failure in -[ConversationViewLayout prepareForCollectionViewUpdates:],
-        //     /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3600.7.47/UICollectionViewLayout.m:760
-        //     *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'While
-        //     preparing update a visible view at <NSIndexPath: 0xc000000011c00016> {length = 2, path = 0 - 142} wasn't
-        //     found in the current data model and was not in an update animation. This is an internal error.'
-        //
-        // I'm unclear if this is a bug in UIKit, or if we're doing something crazy in
-        // ConversationViewLayout#prepareLayout. To reproduce, rapidily insert and delete items into the conversation.
-        // See `DebugUIMessages#thrashCellsInThread:`
-        [UIView animateWithDuration:0.0
+    @try {
+        if (shouldAnimateUpdates) {
+            [self.collectionView performBatchUpdates:batchUpdates completion:batchUpdatesCompletion];
+        } else {
+            // HACK: We use `UIView.animateWithDuration:0` rather than `UIView.performWithAnimation` to work around a
+            // UIKit Crash like:
+            //
+            //     *** Assertion failure in -[ConversationViewLayout prepareForCollectionViewUpdates:],
+            //     /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3600.7.47/UICollectionViewLayout.m:760
+            //     *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'While
+            //     preparing update a visible view at <NSIndexPath: 0xc000000011c00016> {length = 2, path = 0 - 142}
+            //     wasn't found in the current data model and was not in an update animation. This is an internal
+            //     error.'
+            //
+            // I'm unclear if this is a bug in UIKit, or if we're doing something crazy in
+            // ConversationViewLayout#prepareLayout. To reproduce, rapidily insert and delete items into the
+            // conversation. See `DebugUIMessages#thrashCellsInThread:`
+            [UIView
+                animateWithDuration:0.0
                          animations:^{
                              [self.collectionView performBatchUpdates:batchUpdates completion:batchUpdatesCompletion];
                              if (scrollToBottom) {
                                  [self scrollToBottomAnimated:shouldAnimateUpdates];
                              }
                          }];
+        }
+    } @catch (NSException *exception) {
+        OWSFail(@"%@ exception: %@ of type: %@ with reason: %@, user info: %@.",
+            self.logTag,
+            exception.description,
+            exception.name,
+            exception.reason,
+            exception.userInfo);
+        @throw exception;
     }
 
     self.lastReloadDate = [NSDate new];