Fix bug that caused currently selected item to not be found on next unread

Multiplatform/Shared/Sidebar/SidebarExpandedContainers.swift

@@ -26,6 +26,10 @@ struct SidebarExpandedContainers {
 		}
 	}
 	
+	func contains(_ containerID: ContainerIdentifier) -> Bool {
+		return expandedTable.keys.contains(containerID)
+	}
+	
 	subscript(_ containerID: ContainerIdentifier) -> Bool {
 		get {
 			if let result = expandedTable[containerID] {

Multiplatform/Shared/Sidebar/SidebarModel.swift

@@ -289,7 +289,6 @@ private extension SidebarModel {
 				section.visit { sidebarItem in
 					if !foundStartFeed && sidebarItem.feed?.feedID == startingAt.feedID {
 						foundStartFeed = true
-						return false
 					}
 					if foundStartFeed && sidebarItem.unreadCount > 0 {
 						nextSidebarItem = sidebarItem