Remove decoration items from orthogonal sections

Author: kishikawakatsumi

Sources/IBPCollectionViewCompositionalLayout/IBPUICollectionViewCompositionalLayout.m

@@ -456,6 +456,7 @@ - (UICollectionView *)setupOrthogonalScrollViewForSection:(IBPNSCollectionLayout
     IBPNSCollectionLayoutSection *orthogonalSection = section.copy;
     orthogonalSection.contentInsets = IBPNSDirectionalEdgeInsetsZero;
     orthogonalSection.boundarySupplementaryItems = @[];
+    orthogonalSection.decorationItems = @[];
     orthogonalSection.orthogonalScrollingBehavior = IBPUICollectionLayoutSectionOrthogonalScrollingBehaviorNone;
 
     IBPNSCollectionLayoutSize *orthogonalGroupSize = section.group.layoutSize;
@@ -487,15 +488,6 @@ - (UICollectionView *)setupOrthogonalScrollViewForSection:(IBPNSCollectionLayout
                                                                                                                      configuration:configuration];
     collectionViewLayout.parent = self;
     collectionViewLayout.containerSection = section;
-    
-    NSDictionary *decorationClassDict = @{};
-    @try {
-        decorationClassDict = [[self valueForKey:@"_decorationViewClassDict"] copy];
-    } @catch (NSException *exception) {}
-    for (NSString *reuseIdentifier in decorationClassDict) {
-        Class cellClass = decorationClassDict[reuseIdentifier];
-        [collectionViewLayout registerClass:cellClass forDecorationViewOfKind:reuseIdentifier];
-    }
 
     IBPCollectionViewOrthogonalScrollerEmbeddedScrollView *scrollView = [[IBPCollectionViewOrthogonalScrollerEmbeddedScrollView alloc] initWithFrame:CGRectZero
                                                                                                                                 collectionViewLayout:collectionViewLayout];