Fix flickering that happens when unread counts come in to fast

iOS/MasterFeed/MasterFeedViewController.swift

@@ -44,6 +44,8 @@ class MasterFeedViewController: UITableViewController, UndoableCommandRunner {
 	override var canBecomeFirstResponder: Bool {
 		return true
 	}
+	
+	private var reloadCoalescingQueue = CoalescingQueue(name: "Reload Visible", interval: 0.5)
 
 	override func viewDidLoad() {
 
@@ -113,16 +115,7 @@ class MasterFeedViewController: UITableViewController, UndoableCommandRunner {
 			return
 		}
 		
-		var node: Node? = nil
-		if let coordinator = representedObject as? SceneCoordinator, let feed = coordinator.timelineFeed {
-			node = coordinator.rootNode.descendantNodeRepresentingObject(feed as AnyObject)
-		} else {
-			node = coordinator.rootNode.descendantNodeRepresentingObject(representedObject as AnyObject)
-		}
-
-		guard let unreadCountNode = node, let indexPath = coordinator.indexPathFor(unreadCountNode) else { return }
-		tableView.reloadRows(at: [indexPath], with: .none)
-		restoreSelectionIfNecessary(adjustScroll: false)
+		queueReloadAllVisible()
 	}
 
 	@objc func faviconDidBecomeAvailable(_ note: Notification) {
@@ -840,6 +833,14 @@ private extension MasterFeedViewController {
 		return ""
 	}
 
+	func queueReloadAllVisible() {
+		reloadCoalescingQueue.add(self, #selector(reloadQueuedAllVisible))
+	}
+	
+	@objc func reloadQueuedAllVisible() {
+		reloadAllVisibleCells()
+	}
+	
 	func configureCellsForRepresentedObject(_ representedObject: AnyObject) {
 		applyToCellsForRepresentedObject(representedObject, configure)
 	}