fix: some apps should retry observing until it works

alt-tab-macos/api-wrappers/AXUIElement.swift

@@ -50,6 +50,15 @@ extension AXUIElement {
         return attribute(kAXSubroleAttribute, String.self)
     }
 
+    func subscribeWithRetry(_ axObserver: AXObserver, _ notification: String, _ pointer: UnsafeMutableRawPointer?) {
+        let result = AXObserverAddNotification(axObserver, self, notification as CFString, pointer)
+        if result != .success && result != .notificationUnsupported && result != .notificationAlreadyRegistered {
+            DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(10), execute: {
+                self.subscribeWithRetry(axObserver, notification, pointer)
+            })
+        }
+    }
+
     private func attribute<T>(_ key: String, _ type: T.Type) -> T? {
         var value: AnyObject?
         let result = AXUIElementCopyAttributeValue(self, key as CFString, &value)

alt-tab-macos/logic/Application.swift

@@ -30,7 +30,7 @@ class Application: NSObject {
         let windows = getActualWindows()
         debugPrint("Adding app: " + (runningApplication.bundleIdentifier ?? "nil"), windows.map { $0.title() })
         addWindows(windows)
-        observeEvents(windows)
+        observeEvents()
     }
 
     func observeNewWindows() {
@@ -56,7 +56,7 @@ class Application: NSObject {
         Windows.list.insert(contentsOf: windows.map { Window($0, self) }, at: 0)
     }
 
-    private func observeEvents(_ windows: [AXUIElement]) {
+    private func observeEvents() {
         guard let axObserver = axObserver else { return }
         let selfPointer = UnsafeMutableRawPointer(Unmanaged.passUnretained(self).toOpaque())
         for notification in [
@@ -66,7 +66,7 @@ class Application: NSObject {
             kAXApplicationHiddenNotification,
             kAXApplicationShownNotification,
         ] {
-            AXObserverAddNotification(axObserver, axUiElement!, notification as CFString, selfPointer)
+            axUiElement!.subscribeWithRetry(axObserver, notification, selfPointer)
         }
         CFRunLoopAddSource(CFRunLoopGetCurrent(), AXObserverGetRunLoopSource(axObserver), .defaultMode)
     }

alt-tab-macos/logic/Window.swift

@@ -40,7 +40,7 @@ class Window {
             kAXWindowMiniaturizedNotification,
             kAXWindowDeminiaturizedNotification,
         ] {
-            AXObserverAddNotification(axObserver, axUiElement, notification as CFString, nil)
+            axUiElement.subscribeWithRetry(axObserver, notification, nil)
         }
         CFRunLoopAddSource(CFRunLoopGetCurrent(), AXObserverGetRunLoopSource(axObserver), .defaultMode)
     }