Add search articles keyboard shortcut and make search work in three panel mode

iOS/KeyboardManager.swift

@@ -146,6 +146,9 @@ private extension KeyboardManager {
 		let openInBrowserTitle = NSLocalizedString("Open In Browser", comment: "Open In Browser")
 		keys.append(createKeyCommand(title: openInBrowserTitle, action: "openInBrowser:", input: UIKeyCommand.inputRightArrow, modifiers: [.command]))
 
+		let articleSearchTitle = NSLocalizedString("Article Search", comment: "Article Search")
+		keys.append(createKeyCommand(title: articleSearchTitle, action: "articleSearch:", input: "f", modifiers: [.command, .shift]))
+
 		return keys
 	}
 	

iOS/RootSplitViewController.swift

@@ -61,6 +61,10 @@ class RootSplitViewController: UISplitViewController {
 		coordinator.showBrowserForCurrentArticle()
 	}
 	
+	@objc func articleSearch(_ sender: Any?) {
+		coordinator.showSearch()
+	}
+	
 	@objc func addNewFeed(_ sender: Any?) {
 		coordinator.showAdd(.feed)
 	}

iOS/SceneCoordinator.swift

@@ -327,11 +327,7 @@ class SceneCoordinator: NSObject, UndoableCommandRunner, UnreadCountProvider {
 
 	func showSearch() {
 		selectFeed(nil)
-		
+		installTimelineControllerIfNecessary(animated: false)
-		masterTimelineViewController = UIStoryboard.main.instantiateController(ofType: MasterTimelineViewController.self)
-		masterTimelineViewController!.coordinator = self
-		navControllerForTimeline().pushViewController(masterTimelineViewController!, animated: false)
-		
 		DispatchQueue.main.asyncAfter(deadline: .now()) {
 			self.masterTimelineViewController!.showSearchAll()
 		}
@@ -584,12 +580,7 @@ class SceneCoordinator: NSObject, UndoableCommandRunner, UnreadCountProvider {
 		if let ip = indexPath, let node = nodeFor(ip), let fetcher = node.representedObject as? ArticleFetcher {
 			timelineFetcher = fetcher
 			updateSelectingActivity(with: node)
-
+			installTimelineControllerIfNecessary(animated: !automated)
-			if navControllerForTimeline().viewControllers.filter({ $0 is MasterTimelineViewController }).count < 1 {
-				masterTimelineViewController = UIStoryboard.main.instantiateController(ofType: MasterTimelineViewController.self)
-				masterTimelineViewController!.coordinator = self
-				navControllerForTimeline().pushViewController(masterTimelineViewController!, animated: !automated)
-			}
 		} else {
 			timelineFetcher = nil
 
@@ -1473,6 +1464,14 @@ private extension SceneCoordinator {
 	
 	// MARK: Double Split
 	
+	func installTimelineControllerIfNecessary(animated: Bool) {
+		if navControllerForTimeline().viewControllers.filter({ $0 is MasterTimelineViewController }).count < 1 {
+			masterTimelineViewController = UIStoryboard.main.instantiateController(ofType: MasterTimelineViewController.self)
+			masterTimelineViewController!.coordinator = self
+			navControllerForTimeline().pushViewController(masterTimelineViewController!, animated: animated)
+		}
+	}
+	
 	// Note about the Shim Controller
 	// In the root split view controller's secondary (or detail) position we use a view controller that
 	// only acts as a shim (or wrapper) for the actually desired contents of the second position.  This