Fix code style issues

ChatLayout/Classes/Core/ChatLayoutDelegate.swift

@@ -39,15 +39,15 @@ public protocol ChatLayoutDelegate: AnyObject {
     /// - Returns: `Bool`.
     func shouldPresentFooter(_ chatLayout: CollectionViewChatLayout,
                              at sectionIndex: Int) -> Bool
-    
+
     /// `CollectionViewChatLayout` will call this method to ask if it should pin (stick) the header to the visible bounds in the current layout.
     /// - Parameters:
     ///   - chatLayout: `CollectionViewChatLayout` reference.
     ///   - sectionIndex: Index of the section.
     /// - Returns: `Bool`.
     func shouldPinHeaderToVisibleBounds(_ chatLayout: CollectionViewChatLayout,
                                         at sectionIndex: Int) -> Bool
-    
+
     /// `CollectionViewChatLayout` will call this method to ask if it should pin (stick) the footer to the visible bounds in the current layout.
     /// - Parameters:
     ///   - chatLayout: `CollectionViewChatLayout` reference.

ChatLayout/Classes/Core/CollectionViewChatLayout.swift

@@ -624,7 +624,7 @@ open class CollectionViewChatLayout: UICollectionViewLayout {
             cachedCollectionViewInset != .some(adjustedContentInset) ||
             invalidationActions.contains(.shouldInvalidateOnBoundsChange)
             || (isUserInitiatedScrolling && state == .beforeUpdate)
-        
+
         invalidationActions.remove(.shouldInvalidateOnBoundsChange)
         return shouldInvalidateLayout || hasPinnedHeaderOrFooter
     }

ChatLayout/Classes/Core/Model/SectionModel.swift

@@ -144,11 +144,11 @@ struct SectionModel<Layout: ChatLayoutRepresentation> {
     mutating func set(items: ContiguousArray<ItemModel>) {
         self.items = items
     }
-    
+
     mutating func set(footer: ItemModel?) {
         self.footer = footer
     }
-    
+
     mutating func set(isPinHeaderToVisibleBounds: Bool) {
         self.isPinHeaderToVisibleBounds = isPinHeaderToVisibleBounds
     }

ChatLayout/Classes/Core/Model/StateController.swift

@@ -381,14 +381,14 @@ final class StateController<Layout: ChatLayoutRepresentation> {
 
         if kind == .header && section.isPinHeaderToVisibleBounds == true {
             layoutRepresentation.hasPinnedHeaderOrFooter = true
-            let dy = max(min(visibleBounds.minY - section.offsetY, section.height - (section.footer?.size.height ?? 0) - item.size.height), 0)
-            itemFrame.offsettingBy(dx: 0, dy: dy)
+            let offsetY = max(min(visibleBounds.minY - section.offsetY, section.height - (section.footer?.size.height ?? 0) - item.size.height), 0)
+            itemFrame.offsettingBy(dx: 0, dy: offsetY)
         }
-        
+
         if kind == .footer && section.isPinFooterToVisibleBounds == true {
             layoutRepresentation.hasPinnedHeaderOrFooter = true
-            let dy = max(min(0, visibleBounds.maxY - item.size.height - itemFrame.minY), section.offsetY + (section.header?.size.height ?? 0) - itemFrame.minY)
-            itemFrame.offsettingBy(dx: 0, dy: dy)
+            let offsetY = max(min(0, visibleBounds.maxY - item.size.height - itemFrame.minY), section.offsetY + (section.header?.size.height ?? 0) - itemFrame.minY)
+            itemFrame.offsettingBy(dx: 0, dy: offsetY)
         }
 
         if isFinal {

Example/ChatLayout/Chat/View/Data Source/DefaultChatCollectionDataSource.swift

@@ -317,11 +317,11 @@ extension DefaultChatCollectionDataSource: ChatLayoutDelegate {
     public func shouldPresentFooter(_ chatLayout: CollectionViewChatLayout, at sectionIndex: Int) -> Bool {
         true
     }
-    
+
     public func shouldPinFooterToVisibleBounds(_ chatLayout: CollectionViewChatLayout, at sectionIndex: Int) -> Bool {
-        true
+        false
     }
-    
+
     public func shouldPinHeaderToVisibleBounds(_ chatLayout: CollectionViewChatLayout, at sectionIndex: Int) -> Bool {
         true
     }

Example/Tests/MockCollectionLayout.swift

@@ -47,11 +47,11 @@ class MockCollectionLayout: ChatLayoutRepresentation, ChatLayoutDelegate {
     let keepContentOffsetAtBottomOnBatchUpdates: Bool = true
 
     let keepContentAtBottomOfVisibleArea: Bool = false
-    
+
     let processOnlyVisibleItemsOnAnimatedBatchUpdates: Bool = true
-    
+
     var hasPinnedHeaderOrFooter: Bool = false
-    
+
     func numberOfItems(in section: Int) -> Int {
         numberOfItemsInSection[section] ?? 0
     }

Example/Tests/PerformanceTests.swift

@@ -91,7 +91,7 @@ final class PerformanceTests: XCTestCase {
         layout.settings.interSectionSpacing = 0
         layout.controller.set(layout.getPreparedSections(), at: .beforeUpdate)
         layout.hasPinnedHeaderOrFooter = true
-        
+
         let rect = CGRect(origin: CGPoint(x: 0, y: 99999), size: CGSize(width: 300, height: 2))
         let attributes = layout.controller.layoutAttributesForElements(in: rect, state: .beforeUpdate, ignoreCache: true)
         XCTAssertEqual(attributes.count, 2)

Example/Tests/StateControllerProcessUpdatesTests.swift

@@ -385,7 +385,7 @@ class StateControllerProcessUpdatesTests: XCTestCase {
         let item = layout.controller.itemAttributes(for: ItemPath(item: 0, section: 0), kind: .header, at: .beforeUpdate)
         XCTAssertEqual(item?.frame.minY, scrollOffsetY)
     }
-    
+
     func testPinnedFooter() {
         let layout = MockCollectionLayout()
         layout.shouldPinFooterToVisibleBoundsAtSection[0] = true