Add hidden GruberFeedDoubleClickMarkAsRead preference

Mac/AppDefaults.swift

@@ -44,6 +44,7 @@ final class AppDefaults {
 		static let timelineShowsSeparators = "CorreiaSeparators"
 		static let showTitleOnMainWindow = "KafasisTitleMode"
 		static let hideDockUnreadCount = "JustinMillerHideDockUnreadCount"
+		static let feedDoubleClickMarkAsRead = "GruberFeedDoubleClickMarkAsRead"
 
 		#if !MAC_APP_STORE
 			static let webInspectorEnabled = "WebInspectorEnabled"
@@ -203,6 +204,15 @@ final class AppDefaults {
 		}
 	}
 
+	var feedDoubleClickMarkAsRead: Bool {
+		get {
+			return AppDefaults.bool(for: Key.feedDoubleClickMarkAsRead)
+		}
+		set {
+			AppDefaults.setBool(for: Key.feedDoubleClickMarkAsRead, newValue)
+		}
+	}
+
 	#if !MAC_APP_STORE
 		var webInspectorEnabled: Bool {
 			get {

Mac/MainWindow/Sidebar/SidebarViewController.swift

@@ -255,6 +255,11 @@ protocol SidebarDelegate: class {
 		guard outlineView.clickedRow == outlineView.selectedRow else {
 			return
 		}
+		if AppDefaults.shared.feedDoubleClickMarkAsRead, let articles = try? singleSelectedWebFeed?.fetchUnreadArticles() {
+			if let undoManager = undoManager, let markReadCommand = MarkStatusCommand(initialArticles: Array(articles), markingRead: true, undoManager: undoManager) {
+				runCommand(markReadCommand)
+			}
+		}
 		openInBrowser(sender)
 	}