Implement Timeline read filter

Multiplatform/Shared/Sidebar/SidebarView.swift

@@ -33,7 +33,7 @@ struct SidebarView: View {
 						AppAssets.filterInactiveImage
 					}
 				})
-				.padding(.top).padding(.trailing)
+				.padding(.top, 8).padding(.trailing)
 				.buttonStyle(PlainButtonStyle())
 			}
 			ZStack {

Multiplatform/Shared/Timeline/TimelineContainerView.swift

@@ -23,7 +23,7 @@ struct TimelineContainerView: View {
 				.environmentObject(sceneModel.timelineModel)
 				.onAppear {
 					sceneModel.timelineModel.undoManager = undoManager
-					sceneModel.timelineModel.rebuildTimelineItems(feeds: feeds)
+					sceneModel.timelineModel.fetchArticles(feeds: feeds)
 				}
 		} else {
 			EmptyView()

Multiplatform/Shared/Timeline/TimelineModel.swift

@@ -22,8 +22,8 @@ class TimelineModel: ObservableObject, UndoableCommandRunner {
 	
 	@Published var nameForDisplay = ""
 	@Published var timelineItems = [TimelineItem]()
-	@Published var selectedArticleIDs = Set<String>()
-	@Published var selectedArticleID: String? = .none
+	@Published var selectedArticleIDs = Set<String>()  // Don't use directly.  Use selectedArticles
+	@Published var selectedArticleID: String? = .none  // Don't use directly.  Use selectedArticles
 	@Published var selectedArticles = [Article]()
 	@Published var isReadFiltered = false
 
@@ -33,6 +33,7 @@ class TimelineModel: ObservableObject, UndoableCommandRunner {
 	private var selectedArticleIDsCancellable: AnyCancellable?
 	private var selectedArticleIDCancellable: AnyCancellable?
 	private var selectedArticlesCancellable: AnyCancellable?
+	private var selectedReadFilteredCancellable: AnyCancellable?
 
 	private var fetchSerialNumber = 0
 	private let fetchRequestQueue = FetchRequestQueue()
@@ -95,11 +96,16 @@ class TimelineModel: ObservableObject, UndoableCommandRunner {
 				}
 			}
 		}
+		
+		selectedReadFilteredCancellable = $isReadFiltered.sink { [weak self] filter in
+			guard let self = self else { return }
+			self.rebuildTimelineItems(isReadFiltered: filter)
+		}
 	}
 	
 	// MARK: API
 	
-	func rebuildTimelineItems(feeds: [Feed]) {
+	func fetchArticles(feeds: [Feed]) {
 		if feeds.count == 1 {
 			nameForDisplay = feeds.first!.nameForDisplay
 		} else {
@@ -259,8 +265,20 @@ private extension TimelineModel {
 	
 	func replaceArticles(with unsortedArticles: Set<Article>) {
 		articles = Array(unsortedArticles).sortedByDate(sortDirection ? .orderedDescending : .orderedAscending, groupByFeed: groupByFeed)
-		timelineItems = articles.map { TimelineItem(article: $0) }
+		rebuildTimelineItems(isReadFiltered: isReadFiltered)
 		// TODO: Update unread counts and other item done in didSet on AppKit
 	}
 	
+	func rebuildTimelineItems(isReadFiltered: Bool) {
+		let selectedArticleIDs = selectedArticles.map { $0.articleID }
+
+		timelineItems = articles.compactMap { article in
+			if isReadFiltered && article.status.read && !selectedArticleIDs.contains(article.articleID) {
+				return nil
+			} else {
+				return TimelineItem(article: article)
+			}
+		}
+	}
+
 }

Multiplatform/Shared/Timeline/TimelineView.swift

@@ -15,16 +15,34 @@ struct TimelineView: View {
 
 	@ViewBuilder var body: some View {
 		#if os(macOS)
-		ZStack {
-			NavigationLink(destination: ArticleContainerView(articles: timelineModel.selectedArticles), isActive: $navigate) {
-				EmptyView()
-			}.hidden()
-			List(timelineModel.timelineItems, selection: $timelineModel.selectedArticleIDs) { timelineItem in
-				TimelineItemView(timelineItem: timelineItem)
+		VStack {
+			HStack {
+				Spacer()
+				Button (action: {
+					withAnimation {
+						timelineModel.isReadFiltered.toggle()
+					}
+				}, label: {
+					if timelineModel.isReadFiltered {
+						AppAssets.filterActiveImage
+					} else {
+						AppAssets.filterInactiveImage
+					}
+				})
+				.padding(.top, 8).padding(.trailing)
+				.buttonStyle(PlainButtonStyle())
+			}
+			ZStack {
+				NavigationLink(destination: ArticleContainerView(articles: timelineModel.selectedArticles), isActive: $navigate) {
+					EmptyView()
+				}.hidden()
+				List(timelineModel.timelineItems, selection: $timelineModel.selectedArticleIDs) { timelineItem in
+					TimelineItemView(timelineItem: timelineItem)
+				}
+			}
+			.onChange(of: timelineModel.selectedArticleIDs) { value in
+				navigate = !timelineModel.selectedArticleIDs.isEmpty
 			}
-		}
-		.onChange(of: timelineModel.selectedArticleIDs) { value in
-			navigate = !timelineModel.selectedArticleIDs.isEmpty
 		}
 		#else
 		List(timelineModel.timelineItems) { timelineItem in