Partially fix iOS 13 scroll bug

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -4689,12 +4689,16 @@ typedef enum : NSUInteger {
 - (CGPoint)collectionView:(UICollectionView *)collectionView
     targetContentOffsetForProposedContentOffset:(CGPoint)proposedContentOffset
 {
+    if (@available(iOS 13, *)) {
+        
+    } else {
         if (self.menuActionsViewController != nil) {
             NSValue *_Nullable contentOffset = [self contentOffsetForMenuActionInteraction];
             if (contentOffset != nil) {
                 return contentOffset.CGPointValue;
             }
         }
+    }
 
     if (self.scrollContinuity == kScrollContinuityBottom && self.lastKnownDistanceFromBottom) {
         NSValue *_Nullable contentOffset =