Remove unused pageSize from enableLoadMore

Pagination offset (the distance from the top message before we start
loading more) used to be determined by the offset parameter passed to
enableLoadMore, like so:

if ids.prefix(offset + 1).contains(message.id) {
    onEvent?(message)
}

This got changed in 568d00d. Now, we
rely on paginationTargetIndexPath instead, which is hardcoded to be the
last already loaded message:

IndexPath(row: lastSection.rows.count - 1, section: sections.count - 1)

As a result, pageSize is no longer used. Remove it to make sure that
consumers do not expect different behaviour when they modify the
parameter.

Author: matthewrfennell

ChatExample/ChatExample/Screens/ChatExampleView.swift

@@ -25,7 +25,7 @@ struct ChatExampleView: View {
         ChatView(messages: viewModel.messages, chatType: .conversation) { draft in
             viewModel.send(draft: draft)
         }
-        .enableLoadMore(pageSize: 3) { message in
+        .enableLoadMore { message in
             await MainActor.run {
                 viewModel.loadMoreMessage(before: message)
             }

README.md

@@ -253,7 +253,7 @@ These use `AnyView`, so please try to keep them easy enough
 `setMediaPickerSelectionParameters` - a struct holding MediaPicker selection parameters (assetsPickerLimit and others like mediaType, selectionStyle, etc.).   
 `orientationHandler` - handle screen rotation
 
-`enableLoadMore(offset: Int, handler: @escaping ChatPaginationClosure)` - when user scrolls to `offset`-th message from the end, call the handler function, so the user can load more messages. NOTE: New messages won't appear in the chat unless it's scrolled up to the very top - it's an optimization. 
+`enableLoadMore(handler: @escaping ChatPaginationClosure)` - when user scrolls to the final message, call the handler function, to load more messages
 
 ### Customize default UI
 You can use `chatTheme` to customize colors and images of default UI. You can pass all/some colors and images:

Sources/ExyteChat/Managers/PaginationState.swift

@@ -8,10 +8,8 @@ public typealias ChatPaginationClosure = @Sendable (Message) async -> Void
 
 final actor PaginationHandler: ObservableObject {
     let handleClosure: ChatPaginationClosure
-    let pageSize: Int
 
-    init(handleClosure: @escaping ChatPaginationClosure, pageSize: Int) {
+    init(handleClosure: @escaping ChatPaginationClosure) {
         self.handleClosure = handleClosure
-        self.pageSize = pageSize
     }
 }

Sources/ExyteChat/Views/ChatView.swift

@@ -617,11 +617,11 @@ public extension ChatView {
         return view
     }
 
-    /// when user scrolls up to `pageSize`-th meassage, call the handler function, so user can load more messages
+    /// when user scrolls to the final message, call the handler function, to load more messages
     /// NOTE: doesn't work well with `isScrollEnabled` false
-    func enableLoadMore(pageSize: Int, _ handler: @escaping ChatPaginationClosure) -> ChatView {
+    func enableLoadMore(_ handler: @escaping ChatPaginationClosure) -> ChatView {
         var view = self
-        view.paginationHandler = PaginationHandler(handleClosure: handler, pageSize: pageSize)
+        view.paginationHandler = PaginationHandler(handleClosure: handler)
         return view
     }