Fixed detect composition layout.

Author: ivanvorobei

Example Apps/SPDiffable.xcodeproj/project.xcworkspace/xcuserdata/ivanvorobei.xcuserdatad/UserInterfaceState.xcuserstate

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
   s.name = 'SPDiffable'
-  s.version = '1.2.8'
+  s.version = '1.2.9'
   s.summary = 'Extenshion of Diffable API which allow not duplicate code and use less models.'
   s.homepage = 'https://github.com/ivanvorobei/SPDiffable'
   s.source = { :git => 'https://github.com/ivanvorobei/SPDiffable.git', :tag => s.version }

SPDiffable.podspec

@@ -93,12 +93,12 @@ open class SPDiffableCollectionDataSource: UICollectionViewDiffableDataSource<SP
             // In this case we shoudn't set header to section snapshot.
             // For this case it condition only.
             let headerAsFirstElement: Bool = {
-                if collectionView?.collectionViewLayout is UICollectionViewFlowLayout {
-                    return false
-                }
                 if collectionView?.collectionViewLayout is UICollectionViewCompositionalLayout {
                     return true
                 }
+                if collectionView?.collectionViewLayout is UICollectionViewFlowLayout {
+                    return false
+                }
                 return true
             }()