Fixed logic after reoder.

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 = '1.3.6'
+  s.version = '1.3.7'
   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

@@ -94,6 +94,17 @@ open class SPDiffableCollectionDataSource: UICollectionViewDiffableDataSource<SP
                 apply(snapshot, animated: true)
             }
 
+            // Reoder sections
+
+            for (sectionIndex, section) in sections.enumerated() {
+                let previousSectionIndex = sectionIndex - 1
+                guard (sections.count > previousSectionIndex) && (previousSectionIndex >= 0) else { continue }
+                let previousSection = sections[previousSectionIndex]
+                guard let _ = snapshot.sectionIdentifiers.first(where: { $0.identifier == section.identifier }) else { continue }
+                guard let _ = snapshot.sectionIdentifiers.first(where: { $0.identifier == previousSection.identifier }) else { continue }
+                snapshot.moveSection(section, afterSection: previousSection)
+            }
+            
             // Add new sections and update current sections
 
             for section in sections {
@@ -113,17 +124,6 @@ open class SPDiffableCollectionDataSource: UICollectionViewDiffableDataSource<SP
                 apply(sectionSnapshot, to: section, animatingDifferences: animated)
             }
 
-            // Reoder sections
-
-            for (sectionIndex, section) in sections.enumerated() {
-                let previousSectionIndex = sectionIndex - 1
-                guard (sections.count > previousSectionIndex) && (previousSectionIndex >= 0) else { continue }
-                let previousSection = sections[previousSectionIndex]
-                guard let _ = snapshot.sectionIdentifiers.first(where: { $0.identifier == section.identifier }) else { continue }
-                guard let _ = snapshot.sectionIdentifiers.first(where: { $0.identifier == previousSection.identifier }) else { continue }
-                snapshot.moveSection(section, afterSection: previousSection)
-            }
-            
             // Apply changes
 
             apply(snapshot, animated: true)