Improve logging of conversation view exceptions.

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -3468,22 +3468,25 @@ typedef enum : NSUInteger {
         }
     };
 
+    @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
+            // HACK: We use `UIView.animateWithDuration:0` rather than `UIView.performWithAnimation` to work around a
-        // Crash like:
+            // 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
+            //     preparing update a visible view at <NSIndexPath: 0xc000000011c00016> {length = 2, path = 0 - 142}
-        //     found in the current data model and was not in an update animation. This is an internal error.'
+            //     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.
+            // ConversationViewLayout#prepareLayout. To reproduce, rapidily insert and delete items into the
-        // See `DebugUIMessages#thrashCellsInThread:`
+            // conversation. See `DebugUIMessages#thrashCellsInThread:`
-        [UIView animateWithDuration:0.0
+            [UIView
+                animateWithDuration:0.0
                          animations:^{
                              [self.collectionView performBatchUpdates:batchUpdates completion:batchUpdatesCompletion];
                              if (scrollToBottom) {
@@ -3491,6 +3494,15 @@ typedef enum : NSUInteger {
                              }
                          }];
         }
+    } @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];
 }