perf: alt-tab appears quicker when summoned

src/logic/Application.swift

@@ -7,6 +7,8 @@ class Application: NSObject {
     var axUiElement: AXUIElement?
     var axObserver: AXObserver?
     var isReallyFinishedLaunching = false
+    var isHidden: Bool!
+    var icon: NSImage?
     var dockLabel: String?
 
     static func notifications(_ app: NSRunningApplication) -> [String] {
@@ -30,6 +32,8 @@ class Application: NSObject {
     init(_ runningApplication: NSRunningApplication) {
         self.runningApplication = runningApplication
         super.init()
+        isHidden = runningApplication.isHidden
+        icon = runningApplication.icon
         addAndObserveWindows()
         kvObservers = [
             runningApplication.observe(\.isFinishedLaunching, options: [.new]) { [weak self] _, _ in self?.addAndObserveWindows() },

src/logic/Window.swift

@@ -4,10 +4,10 @@ class Window {
     var cgWindowId: CGWindowID
     var title: String!
     var thumbnail: NSImage?
-    var icon: NSImage? { get { application.runningApplication.icon } }
+    var icon: NSImage? { get { application.icon } }
     var shouldShowTheUser = true
     var isTabbed: Bool = false
-    var isHidden: Bool { get { application.runningApplication.isHidden } }
+    var isHidden: Bool { get { application.isHidden } }
     var dockLabel: Int? { get { application.dockLabel.flatMap { Int($0) } } }
     var isFullscreen: Bool
     var isMinimized: Bool

src/logic/events/AccessibilityEvents.swift

@@ -84,6 +84,9 @@ private func applicationActivated(_ element: AXUIElement) throws {
 
 private func applicationHiddenOrShown(_ element: AXUIElement, _ pid: pid_t, _ type: String) throws {
     DispatchQueue.main.async {
+        if let app = (Applications.list.first { $0.runningApplication.processIdentifier == pid }) {
+            app.isHidden = type == kAXApplicationHiddenNotification
+        }
         let windows = Windows.list.filter {
             // for AXUIElement of apps, CFEqual or == don't work; looks like a Cocoa bug
             return $0.application.runningApplication.processIdentifier == pid