fix: load app badges asynchronously to avoid system lag (closes #563)

src/logic/Applications.swift

@@ -66,21 +66,38 @@ class Applications {
     }
 
     static func refreshBadges() {
-        let group = DispatchGroup()
-        retryAxCallUntilTimeout(group) {
-            if let dockPid = (Applications.list.first { $0.runningApplication.bundleIdentifier == "com.apple.dock" }?.pid),
+        if !App.app.appIsBeingUsed || Preferences.hideAppBadges { return }
+        retryAxCallUntilTimeout {
+            if let dockPid = (list.first { $0.runningApplication.bundleIdentifier == "com.apple.dock" }?.pid),
                let axList = (try AXUIElementCreateApplication(dockPid).children()?.first { try $0.role() == "AXList" }),
                let axAppDockItem = (try axList.children()?.filter { try $0.subrole() == "AXApplicationDockItem" && ($0.appIsRunning() ?? false) }) {
-                try Applications.list.forEach { app in
-                    if app.runningApplication.activationPolicy == .regular,
-                       let bundleId = app.runningApplication.bundleIdentifier,
-                       let url = NSWorkspace.shared.urlForApplication(withBundleIdentifier: bundleId) {
-                        app.dockLabel = try axAppDockItem.first { try $0.attribute(kAXURLAttribute, URL.self) == url }?.attribute(kAXStatusLabelAttribute, String.self)
-                    }
+                let axAppDockItemUrlAndLabel = try axAppDockItem.map { try ($0.attribute(kAXURLAttribute, URL.self), $0.attribute(kAXStatusLabelAttribute, String.self)) }
+                DispatchQueue.main.async {
+                    refreshBadges_(axAppDockItemUrlAndLabel)
+                }
+            }
+        }
+    }
+
+    static func refreshBadges_(_ items: [(URL?, String?)], _ currentIndex: Int = 0) {
+        Windows.list.enumerated().forEach { (i, window) in
+            let view = ThumbnailsView.recycledViews[i]
+            if let app = (Applications.list.first { window.application.pid == $0.pid }) {
+                if App.app.appIsBeingUsed,
+                   app.runningApplication.activationPolicy == .regular,
+                   let bundleId = app.runningApplication.bundleIdentifier,
+                   let url = NSWorkspace.shared.urlForApplication(withBundleIdentifier: bundleId),
+                   let matchingItem = (items.first { $0.0 == url }),
+                   let label = matchingItem.1,
+                   let labelInt = Int(label) {
+                    app.dockLabel = label
+                    view.updateDockLabelIcon(labelInt)
+                } else {
+                    app.dockLabel = nil
+                    assignIfDifferent(&view.dockLabelIcon.isHidden, true)
                 }
             }
         }
-        _ = group.wait(wallTimeout: .now() + .seconds(1))
     }
 
     private static func isActualApplication(_ app: NSRunningApplication) -> Bool {

src/logic/Windows.swift

@@ -153,8 +153,7 @@ class Windows {
     }
 
     static func refreshThumbnailsAsync(_ screen: NSScreen, _ currentIndex: Int = criticalFirstThumbnails) {
-        guard App.app.appIsBeingUsed else { return }
-        if Preferences.hideThumbnails { return }
+        if !App.app.appIsBeingUsed || Preferences.hideThumbnails { return }
         BackgroundWork.mainQueueConcurrentWorkQueue.async {
             if currentIndex < list.count {
                 let window = list[currentIndex]

src/ui/App.swift

@@ -264,5 +264,7 @@ class App: AppCenterApplication, NSApplicationDelegate {
         thumbnailsPanel.show()
         guard appIsBeingUsed else { return }
         Windows.refreshThumbnailsAsync(screen)
+        guard appIsBeingUsed else { return }
+        Applications.refreshBadges()
     }
 }

src/ui/main-window/ThumbnailView.swift

@@ -135,16 +135,7 @@ class ThumbnailView: NSStackView {
                 spaceIcon.setNumber(element.spaceIndex, false)
             }
         }
-        assignIfDifferent(&dockLabelIcon.isHidden, element.dockLabel == nil || Preferences.hideAppBadges || Preferences.iconSize == 0)
-        if !dockLabelIcon.isHidden, let dockLabel = element.dockLabel {
-            let view = dockLabelIcon.subviews[1] as! ThumbnailFontIconView
-            if dockLabel > 30 {
-                view.setFilledStar()
-            } else {
-                view.setNumber(dockLabel, true)
-            }
-            dockLabelIcon.setFrameOrigin(NSPoint(x: appIcon.frame.maxX - dockLabelIcon.fittingSize.width - 1, y: appIcon.frame.maxY - dockLabelIcon.fittingSize.height + 4))
-        }
+        updateDockLabelIcon(element.dockLabel)
         assignIfDifferent(&frame.size.width, max((Preferences.hideThumbnails ? hStackView.fittingSize.width : thumbnail.frame.size.width) + Preferences.intraCellPadding * 2, ThumbnailView.widthMin(screen)).rounded())
         assignIfDifferent(&frame.size.height, newHeight)
         let fontIconWidth = CGFloat([fullscreenIcon, minimizedIcon, hiddenIcon, spaceIcon].filter { !$0.isHidden }.count) * (Preferences.fontHeight + Preferences.intraCellPadding)
@@ -170,6 +161,19 @@ class ThumbnailView: NSStackView {
         }
     }
 
+    func updateDockLabelIcon(_ dockLabel: Int?) {
+        assignIfDifferent(&dockLabelIcon.isHidden, dockLabel == nil || Preferences.hideAppBadges || Preferences.iconSize == 0)
+        if !dockLabelIcon.isHidden, let dockLabel = dockLabel {
+            let view = dockLabelIcon.subviews[1] as! ThumbnailFontIconView
+            if dockLabel > 30 {
+                view.setFilledStar()
+            } else {
+                view.setNumber(dockLabel, true)
+            }
+            dockLabelIcon.setFrameOrigin(NSPoint(x: appIcon.frame.maxX - dockLabelIcon.fittingSize.width - 1, y: appIcon.frame.maxY - dockLabelIcon.fittingSize.height + 4))
+        }
+    }
+
     private func observeDragAndDrop() {
         // NSImageView instances are registered to drag-and-drop by default
         thumbnail.unregisterDraggedTypes()