From 2d6bbe1773aaf2f74070a25e7e3032b811a3ab2b Mon Sep 17 00:00:00 2001
From: Ariver <shanghai3168@gmail.com>
Date: Thu, 28 May 2026 23:47:55 +0800
Subject: [PATCH] Enhance tag drag lift feedback

---
 Apptag/ApptagApp.swift |  416 +++++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 files changed, 363 insertions(+), 53 deletions(-)

diff --git a/Apptag/ApptagApp.swift b/Apptag/ApptagApp.swift
index b78c05a..81eca50 100644
--- a/Apptag/ApptagApp.swift
+++ b/Apptag/ApptagApp.swift
@@ -6,7 +6,12 @@
 
 @main
 struct TagLauncherApp: App {
+    private static let singletonLockFile = TagLauncherProcessSingleton.acquireOrHandOffAndExit()
     @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
+
+    init() {
+        _ = Self.singletonLockFile
+    }
 
     var body: some Scene {
         Settings {
@@ -16,6 +21,7 @@
         .commands {
             CommandGroup(replacing: .systemServices) { }
             CommandGroup(replacing: .appVisibility) { }
+            CommandGroup(replacing: .help) { }
         }
     }
 }
@@ -37,6 +43,10 @@
     private static let statusItemButtonIdentifier = NSUserInterfaceItemIdentifier("TagLauncherStatusItemButton")
     private static let statusItemAccessibilityLabel = AppIdentity.displayName
     private static let showAppListMenuItemIdentifier = NSUserInterfaceItemIdentifier("TagLauncherShowAppListMenuItem")
+    private static let helpMenuItemIdentifier = NSUserInterfaceItemIdentifier("TagLauncherHelpMenu")
+    private static let downloadHelpMenuItemIdentifier = NSUserInterfaceItemIdentifier("TagLauncherDownloadHelpMenuItem")
+    private static let externalActivationNotification = Notification.Name("TagLauncherExternalActivationRequested")
+    private static let externalActivationObject = AppIdentity.bundleIdentifier
     private static let launcherOverlayLevel = NSWindow.Level(rawValue: NSWindow.Level.mainMenu.rawValue - 1)
     private static let overlayDefaultLevel = launcherOverlayLevel
     private static let overlayTextInputLevel = launcherOverlayLevel
@@ -57,10 +67,16 @@
     private var lastShowDockIcon: Bool?
     private var statusMenuScreenForNextOverlay: NSScreen?
     private var overlayGeneration = 0
+    private var overlayAvoidsSpaceSwitch = false
     private var suppressReopenUntil = Date.distantPast
 
     private struct OverlayPlacementContext {
         let screen: NSScreen
+        let frame: NSRect
+    }
+
+    private struct ForeignWindowFrame {
+        let owner: String
         let frame: NSRect
     }
 
@@ -74,6 +90,10 @@
 
     private var requiresForegroundOwnership: Bool {
         isOverlayVisible || isSettingsVisible
+    }
+
+    private var shouldStageOverlayAsAccessory: Bool {
+        !isSettingsVisible && !UserDefaults.standard.bool(forKey: Self.showDockIconKey)
     }
 
     private var currentOverlayLevel: NSWindow.Level {
@@ -112,6 +132,7 @@
         observeAppNoteEditing()
         observeQuickSearch()
         observePreferencesRequests()
+        observeExternalActivationRequests()
         observeApplicationMenuChanges()
         observeChromeSettings()
         observeLanguageChanges()
@@ -127,7 +148,7 @@
     /// Dock icon click → show overlay (same as menubar "Show TagLauncher")
     func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows flag: Bool) -> Bool {
         guard Date() >= suppressReopenUntil else { return false }
-        showOverlay()
+        showOrFocusOverlay()
         return false  // Suppress default "unhide all windows" behavior
     }
 
@@ -138,6 +159,11 @@
         TagDatabase.flushPendingCategorySchemeBackupBatch()
         removeOverlayKeyMonitor()
         removeQuickSearchExternalMouseMonitor()
+        DistributedNotificationCenter.default().removeObserver(
+            self,
+            name: Self.externalActivationNotification,
+            object: Self.externalActivationObject
+        )
     }
 
     /// Ensure defaultGroupName is always the language-neutral key "Other".
@@ -240,13 +266,17 @@
         }
     }
 
-    private func refreshLauncherChromeState(activate: Bool = false) {
+    private func refreshLauncherChromeState(activate: Bool = false, avoidSpaceSwitch: Bool = false) {
         let showDock = UserDefaults.standard.bool(forKey: Self.showDockIconKey)
         lastShowDockIcon = showDock
 
-        let desiredPolicy: NSApplication.ActivationPolicy = requiresForegroundOwnership
+        let shouldStayAccessoryForCurrentFullscreenSpace = isOverlayVisible
+            && (avoidSpaceSwitch || overlayAvoidsSpaceSwitch)
+        let desiredPolicy: NSApplication.ActivationPolicy = shouldStayAccessoryForCurrentFullscreenSpace
+            ? .accessory
+            : (requiresForegroundOwnership
             ? .regular
-            : (showDock ? .regular : .accessory)
+            : (showDock ? .regular : .accessory))
         if NSApp.activationPolicy() != desiredPolicy {
             NSApp.setActivationPolicy(desiredPolicy)
         }
@@ -256,7 +286,7 @@
             NSApp.presentationOptions = desiredPresentation
         }
 
-        if activate && requiresForegroundOwnership {
+        if activate && requiresForegroundOwnership && !shouldStayAccessoryForCurrentFullscreenSpace {
             let keyWindow = isSettingsVisible ? settingsWindow : (isOverlayVisible ? overlayWindow : nil)
             claimLauncherForeground(
                 keyWindow: keyWindow,
@@ -267,13 +297,14 @@
     }
 
     private func handleApplicationDidResignActive() {
+        guard !isOverlayVisible else {
+            return
+        }
+
         if isQuickSearchOpen {
             NotificationCenter.default.post(name: .tagLauncherQuickSearchDismissRequested, object: nil)
         }
 
-        guard !isOverlayVisible else {
-            return
-        }
         if !requiresForegroundOwnership {
             refreshLauncherChromeState()
         }
@@ -306,7 +337,7 @@
         guard supportsLaunchAtLogin else { return }
         let plist: [String: Any] = [
             "Label": Self.launchAgentLabel,
-            "ProgramArguments": ["open", Bundle.main.bundlePath, "--hide"],
+            "ProgramArguments": Self.expectedLaunchAgentProgramArguments(),
             "RunAtLoad": true,
         ]
         let dir = Self.launchAgentURL.deletingLastPathComponent()
@@ -314,10 +345,16 @@
         (plist as NSDictionary).write(to: Self.launchAgentURL, atomically: true)
 
         let uid = getuid()
+        let bootoutTask = Process()
+        bootoutTask.launchPath = "/bin/launchctl"
+        bootoutTask.arguments = ["bootout", "gui/\(uid)/\(Self.launchAgentLabel)"]
+        try? bootoutTask.run()
+        bootoutTask.waitUntilExit()
+
         let task = Process()
         task.launchPath = "/bin/launchctl"
         task.arguments = ["bootstrap", "gui/\(uid)", Self.launchAgentURL.path]
-        task.launch()
+        try? task.run()
     }
 
     static func disableLaunchAtLogin() {
@@ -326,8 +363,23 @@
         let task = Process()
         task.launchPath = "/bin/launchctl"
         task.arguments = ["bootout", "gui/\(uid)/\(Self.launchAgentLabel)"]
-        task.launch()
+        try? task.run()
         try? FileManager.default.removeItem(at: Self.launchAgentURL)
+    }
+
+    private static func launchAgentProgramArguments() -> [String]? {
+        guard let plist = NSDictionary(contentsOf: Self.launchAgentURL) as? [String: Any] else {
+            return nil
+        }
+        return plist["ProgramArguments"] as? [String]
+    }
+
+    private static func expectedLaunchAgentProgramArguments() -> [String] {
+        let executablePath = Bundle.main.executablePath
+            ?? Bundle.main.bundleURL
+                .appendingPathComponent("Contents/MacOS/\(AppIdentity.displayName)")
+                .path
+        return [executablePath, "--hide"]
     }
 
     /// On first launch, enable login item by default via LaunchAgent.
@@ -340,7 +392,14 @@
             return
         }
         let key = "launchAtLogin"
-        if !AppDefaults.hasStoredValue(for: key) && UserDefaults.standard.bool(forKey: key) {
+        guard UserDefaults.standard.bool(forKey: key) else {
+            Self.disableLaunchAtLogin()
+            return
+        }
+
+        let expectedArguments = Self.expectedLaunchAgentProgramArguments()
+        if !AppDefaults.hasStoredValue(for: key)
+            || Self.launchAgentProgramArguments() != expectedArguments {
             Self.enableLaunchAtLogin()
         }
     }
@@ -538,6 +597,7 @@
             }
 
             self.configureApplicationMenu()
+            self.configureHelpMenu()
             if retries > 0 && self.applicationMenuNeedsCleanup() {
                 self.configureApplicationMenuWhenAvailable(retries: retries - 1)
             }
@@ -656,6 +716,42 @@
         }
     }
 
+    private func configureHelpMenu() {
+        guard let mainMenu = NSApp.mainMenu else { return }
+        NSApp.helpMenu = nil
+
+        for item in mainMenu.items.reversed() {
+            let isHelpMenu = item.identifier == Self.helpMenuItemIdentifier
+                || item.title.localizedCaseInsensitiveContains("help")
+                || item.title == tr("menu.help")
+                || item.submenu?.title.localizedCaseInsensitiveContains("help") == true
+                || item.submenu?.title == tr("menu.help")
+            if isHelpMenu {
+                mainMenu.removeItem(item)
+            }
+        }
+
+        let menuItem = NSMenuItem(title: tr("menu.help"), action: nil, keyEquivalent: "")
+        let helpMenu = NSMenu(title: tr("menu.help"))
+        menuItem.identifier = Self.helpMenuItemIdentifier
+        menuItem.submenu = helpMenu
+
+        let downloadItem = NSMenuItem()
+        downloadItem.identifier = Self.downloadHelpMenuItemIdentifier
+        downloadItem.title = tr("help.downloadPDF")
+        downloadItem.action = #selector(openLocalizedHelp(_:))
+        downloadItem.target = self
+        downloadItem.keyEquivalent = ""
+        downloadItem.keyEquivalentModifierMask = []
+        downloadItem.isEnabled = true
+        helpMenu.addItem(downloadItem)
+        mainMenu.addItem(menuItem)
+    }
+
+    @objc private func openLocalizedHelp(_ sender: Any? = nil) {
+        NSWorkspace.shared.open(HelpDocument.currentURL)
+    }
+
     private func removeMenuBarItem() {
         guard let statusItem else { return }
         NSStatusBar.system.removeStatusItem(statusItem)
@@ -684,6 +780,32 @@
         }
     }
 
+    private func showOrFocusOverlay(preferredScreen: NSScreen? = nil) {
+        let placement = overlayPlacementContextForNextOverlay(preferredScreen: preferredScreen)
+        let shouldAvoidSpaceSwitch = placement.map { hasFullscreenWindowOnScreen($0.screen) } ?? false
+        if let overlayWindow, overlayWindow.isVisible {
+            overlayAvoidsSpaceSwitch = shouldAvoidSpaceSwitch
+            moveOverlayToCurrentPlacement(preferredScreen: preferredScreen)
+            overlayWindow.level = currentOverlayLevel
+            refreshLauncherChromeState(activate: !shouldAvoidSpaceSwitch, avoidSpaceSwitch: shouldAvoidSpaceSwitch)
+            overlayWindow.makeKeyAndOrderFront(nil)
+            overlayWindow.orderFrontRegardless()
+            if let settingsWindow, settingsWindow.isVisible {
+                prepareSettingsWindow(settingsWindow)
+            }
+            return
+        }
+        showOverlay(preferredScreen: preferredScreen)
+    }
+
+    private func moveOverlayToCurrentPlacement(preferredScreen: NSScreen?) {
+        guard let overlayWindow,
+              let placement = overlayPlacementContextForNextOverlay(preferredScreen: preferredScreen),
+              overlayWindow.frame != placement.frame
+        else { return }
+        overlayWindow.setFrame(placement.frame, display: true)
+    }
+
     private func showOverlay(
         initialQuickSearchSource: String? = nil,
         preferredScreen: NSScreen? = nil,
@@ -691,12 +813,17 @@
     ) {
         guard let placement = overlayPlacementContextForNextOverlay(preferredScreen: preferredScreen) else { return }
 
-        if !stagedForAllSpaces && !isSettingsVisible && NSApp.isActive {
+        let shouldAvoidSpaceSwitch = hasFullscreenWindowOnScreen(placement.screen)
+        let shouldStageAsAccessory = shouldStageOverlayAsAccessory || shouldAvoidSpaceSwitch
+
+        if !stagedForAllSpaces && shouldStageAsAccessory {
             // Let the all-spaces panel attach to the pointer's display before the app reclaims focus.
             if NSApp.activationPolicy() != .accessory {
                 NSApp.setActivationPolicy(.accessory)
             }
-            NSApp.deactivate()
+            if NSApp.isActive {
+                NSApp.deactivate()
+            }
             DispatchQueue.main.asyncAfter(deadline: .now() + 0.08) { [weak self] in
                 self?.showOverlay(
                     initialQuickSearchSource: initialQuickSearchSource,
@@ -713,6 +840,7 @@
             existingWindow.orderOut(nil)
             overlayWindow = nil
         }
+        overlayAvoidsSpaceSwitch = shouldAvoidSpaceSwitch
 
         let window = makeOverlayWindow(
             on: placement.screen,
@@ -721,7 +849,7 @@
         overlayGeneration &+= 1
         overlayWindow = window
         installOverlayKeyMonitor()
-        if !isSettingsVisible {
+        if shouldStageAsAccessory {
             if NSApp.isActive {
                 NSApp.deactivate()
             }
@@ -740,7 +868,7 @@
         let placementFrame = placement.frame
         let finishForegroundClaim: () -> Void = { [weak self, weak window] in
             guard let self, let window, self.overlayWindow === window else { return }
-            self.refreshLauncherChromeState(activate: true)
+            self.refreshLauncherChromeState(activate: !shouldAvoidSpaceSwitch, avoidSpaceSwitch: shouldAvoidSpaceSwitch)
             if window.frame != placementFrame {
                 window.setFrame(placementFrame, display: true)
                 window.makeKeyAndOrderFront(nil)
@@ -752,11 +880,105 @@
             NotificationCenter.default.post(name: .tagLauncherOverlayDidShow, object: nil)
         }
 
-        if !isSettingsVisible && stagedForAllSpaces {
+        if !isSettingsVisible {
             DispatchQueue.main.asyncAfter(deadline: .now() + 0.12, execute: finishForegroundClaim)
         } else {
             finishForegroundClaim()
         }
+    }
+
+    private func hasFullscreenWindowOnScreen(_ screen: NSScreen) -> Bool {
+        let screenFrame = screen.frame
+        let windowFrames = foreignLayerZeroWindows(on: screenFrame)
+
+        if windowFrames.contains(where: { isSingleFullscreenWindow($0.frame, on: screenFrame) }) {
+            return true
+        }
+
+        return hasSplitViewFullscreenWindows(windowFrames, on: screenFrame)
+    }
+
+    private func foreignLayerZeroWindows(on screenFrame: NSRect) -> [ForeignWindowFrame] {
+        let windows = CGWindowListCopyWindowInfo([.optionOnScreenOnly, .excludeDesktopElements], kCGNullWindowID) as? [[String: Any]] ?? []
+        return windows.compactMap { info in
+            guard let owner = info[kCGWindowOwnerName as String] as? String,
+                  owner != AppIdentity.displayName,
+                  owner != "Window Server",
+                  owner != "Dock",
+                  owner != "loginwindow",
+                  let layer = info[kCGWindowLayer as String] as? Int,
+                  layer == 0,
+                  let bounds = info[kCGWindowBounds as String] as? NSDictionary
+            else { return nil }
+
+            let frame = NSRect(
+                x: cgWindowDimension(bounds, "X"),
+                y: cgWindowDimension(bounds, "Y"),
+                width: cgWindowDimension(bounds, "Width"),
+                height: cgWindowDimension(bounds, "Height")
+            )
+            guard frame.intersects(screenFrame) else { return nil }
+            return ForeignWindowFrame(owner: owner, frame: frame)
+        }
+    }
+
+    private func isSingleFullscreenWindow(_ windowFrame: NSRect, on screenFrame: NSRect) -> Bool {
+        let widthMatches = abs(windowFrame.width - screenFrame.width) <= 12
+        let heightMatches = windowFrame.height >= screenFrame.height * 0.88
+        let horizontallyAligned = abs(windowFrame.midX - screenFrame.midX) <= 12
+        let verticallyAligned = abs(windowFrame.maxY - screenFrame.maxY) <= 32
+        return widthMatches && heightMatches && horizontallyAligned && verticallyAligned
+    }
+
+    private func hasSplitViewFullscreenWindows(_ windows: [ForeignWindowFrame], on screenFrame: NSRect) -> Bool {
+        let clippedWindows = windows.map {
+            ForeignWindowFrame(owner: $0.owner, frame: $0.frame.intersection(screenFrame))
+        }
+        let tallWindows = clippedWindows
+            .filter { window in
+                let frame = window.frame
+                return frame.height >= screenFrame.height * 0.86
+                    && frame.width >= screenFrame.width * 0.20
+                    && frame.width <= screenFrame.width * 0.86
+                    && abs(frame.maxY - screenFrame.maxY) <= 32
+            }
+            .sorted { $0.frame.minX < $1.frame.minX }
+
+        guard tallWindows.count >= 2 else { return false }
+
+        for startIndex in tallWindows.indices {
+            var union = tallWindows[startIndex].frame
+            var lastMaxX = union.maxX
+
+            for window in tallWindows.dropFirst(startIndex + 1) {
+                let gap = window.frame.minX - lastMaxX
+                if gap < -32 || gap > 48 {
+                    break
+                }
+                union = union.union(window.frame)
+                lastMaxX = max(lastMaxX, window.frame.maxX)
+
+                let touchesLeft = abs(union.minX - screenFrame.minX) <= 32
+                let touchesRight = abs(union.maxX - screenFrame.maxX) <= 32
+                let coversWidth = union.width >= screenFrame.width * 0.92
+                let coversHeight = union.height >= screenFrame.height * 0.86
+                if touchesLeft && touchesRight && coversWidth && coversHeight {
+                    return true
+                }
+            }
+        }
+
+        return false
+    }
+
+    private func cgWindowDimension(_ bounds: NSDictionary, _ key: String) -> CGFloat {
+        if let value = bounds[key] as? CGFloat {
+            return value
+        }
+        if let value = bounds[key] as? NSNumber {
+            return CGFloat(truncating: value)
+        }
+        return 0
     }
 
     private func installOverlayKeyMonitor() {
@@ -766,6 +988,9 @@
             guard self.shouldHandleOverlayKeyEvent(event) else { return event }
             if event.keyCode == 53 { // Escape
                 if self.isQuickSearchOpen {
+                    self.isQuickSearchOpen = false
+                    self.removeQuickSearchExternalMouseMonitor()
+                    self.updateOverlayLevelForTextInput()
                     NotificationCenter.default.post(name: .tagLauncherQuickSearchDismissRequested, object: nil)
                     return nil
                 }
@@ -773,19 +998,32 @@
                 return nil
             }
             if self.shouldOpenQuickSearch(for: event) {
-                NotificationCenter.default.post(
-                    name: .tagLauncherQuickSearchRequested,
-                    object: nil,
-                    userInfo: ["source": QuickSearchOpenSource.mainOverlay]
-                )
+                self.requestQuickSearch(source: QuickSearchOpenSource.mainOverlay)
                 return nil
             }
             return event
         }
     }
 
+    private func requestQuickSearch(source: String) {
+        isQuickSearchOpen = true
+        promoteOverlayToForegroundInput()
+        updateOverlayLevelForTextInput()
+        installQuickSearchExternalMouseMonitor()
+        DispatchQueue.main.async {
+            NotificationCenter.default.post(
+                name: .tagLauncherQuickSearchRequested,
+                object: nil,
+                userInfo: ["source": source]
+            )
+        }
+    }
+
     private func shouldHandleOverlayKeyEvent(_ event: NSEvent) -> Bool {
         guard overlayWindow?.isVisible == true else { return false }
+        if !isSettingsVisible && NSApp.isActive {
+            return true
+        }
         if event.window == overlayWindow { return true }
         return event.window == nil && NSApp.keyWindow == overlayWindow
     }
@@ -801,26 +1039,7 @@
               !isModalInteractionActive
         else { return false }
 
-        guard let firstResponder = overlayWindow?.firstResponder else { return true }
-        if firstResponder is NSText || firstResponder is NSTextField {
-            return false
-        }
-        if let responderView = firstResponder as? NSView,
-           viewOrAncestorHandlesSpace(responderView) {
-            return false
-        }
         return true
-    }
-
-    private func viewOrAncestorHandlesSpace(_ view: NSView) -> Bool {
-        var current: NSView? = view
-        while let candidate = current {
-            if candidate is NSButton || candidate is NSSegmentedControl || candidate is NSSlider {
-                return true
-            }
-            current = candidate.superview
-        }
-        return false
     }
 
     private func removeOverlayKeyMonitor() {
@@ -839,7 +1058,8 @@
         )
         panel.isFloatingPanel = true
         panel.hidesOnDeactivate = false
-        // This combination keeps the overlay on the pointer display, including fullscreen Spaces.
+        // Keep the overlay publishable above fullscreen Spaces without asking
+        // AppKit to migrate an all-spaces window between Spaces.
         panel.collectionBehavior = [
             .canJoinAllSpaces,
             .fullScreenAuxiliary,
@@ -877,6 +1097,7 @@
         overlayWindow?.orderOut(nil)
         removeOverlayKeyMonitor()
         removeQuickSearchExternalMouseMonitor()
+        overlayAvoidsSpaceSwitch = false
         refreshLauncherChromeState()
         NotificationCenter.default.post(name: .tagLauncherOverlayDidHide, object: nil)
         if discardWindow {
@@ -982,13 +1203,11 @@
 
     private func showQuickSearchFromGlobalHotkey() {
         if overlayWindow?.isVisible == true {
-            guard !isSettingsVisible else { return }
-            refreshLauncherChromeState(activate: true)
-            NotificationCenter.default.post(
-                name: .tagLauncherQuickSearchRequested,
-                object: nil,
-                userInfo: ["source": QuickSearchOpenSource.globalVisible]
+            refreshLauncherChromeState(
+                activate: !overlayAvoidsSpaceSwitch,
+                avoidSpaceSwitch: overlayAvoidsSpaceSwitch
             )
+            requestQuickSearch(source: QuickSearchOpenSource.globalVisible)
             return
         }
         showOverlay(initialQuickSearchSource: QuickSearchOpenSource.globalHidden)
@@ -1035,6 +1254,19 @@
                 return
             }
 
+            if self.isMenuTrackingWindow(keyWindow) {
+                return
+            }
+
+            if self.isAppOwnedDocumentWindow(keyWindow) {
+                self.prepareSettingsWindow(keyWindow)
+                return
+            }
+
+            if NSApp.windows.contains(keyWindow) {
+                return
+            }
+
             // Settings/Preferences window -> float it above overlay for real-time preview.
             if self.isSettingsWindowCandidate(keyWindow) {
                 self.prepareSettingsWindow(keyWindow)
@@ -1070,12 +1302,20 @@
 
         var behavior = window.collectionBehavior
         behavior.remove(.canJoinAllSpaces)
-        behavior.formUnion([.fullScreenAuxiliary, .moveToActiveSpace])
+        if overlayAvoidsSpaceSwitch {
+            behavior.remove(.moveToActiveSpace)
+            behavior.formUnion([.fullScreenAuxiliary, .stationary, .transient, .ignoresCycle])
+        } else {
+            behavior.formUnion([.fullScreenAuxiliary, .moveToActiveSpace])
+        }
         window.collectionBehavior = behavior
         window.makeKeyAndOrderFront(nil)
         window.orderFrontRegardless()
         settingsWindow = window
-        refreshLauncherChromeState(activate: true)
+        refreshLauncherChromeState(
+            activate: !overlayAvoidsSpaceSwitch,
+            avoidSpaceSwitch: overlayAvoidsSpaceSwitch
+        )
     }
 
     private func attachSettingsWindow(_ window: NSWindow, to overlayWindow: NSWindow) {
@@ -1092,12 +1332,47 @@
     private func isSettingsWindowCandidate(_ window: NSWindow) -> Bool {
         if window == settingsWindow { return true }
         if window.identifier?.rawValue == "TagLauncherPreferencesWindow" { return true }
+        if isAppOwnedDocumentWindow(window) { return true }
         guard NSApp.windows.contains(window),
               window != overlayWindow,
               window.isVisible,
               !(window is NSPanel)
         else { return false }
-        return true
+        return settingsWindowTitleCandidates().contains(normalizedWindowTitle(window.title))
+    }
+
+    private func isAppOwnedDocumentWindow(_ window: NSWindow) -> Bool {
+        NSApp.windows.contains(window)
+            && window != overlayWindow
+            && window.isVisible
+            && !(window is NSPanel)
+            && !isMenuTrackingWindow(window)
+            && window.styleMask.contains(.titled)
+    }
+
+    private func isMenuTrackingWindow(_ window: NSWindow) -> Bool {
+        let className = NSStringFromClass(type(of: window))
+        return className.localizedCaseInsensitiveContains("Menu")
+            || className.localizedCaseInsensitiveContains("Popup")
+    }
+
+    private func settingsWindowTitleCandidates() -> Set<String> {
+        let keys = [
+            "menu.preferences",
+            "settings.language",
+            "settings.general",
+            "quickSearch.hotkeys",
+            "settings.tags",
+            "settings.data",
+            "settings.about"
+        ]
+        return Set(keys.map { normalizedWindowTitle(tr($0)) })
+    }
+
+    private func normalizedWindowTitle(_ title: String) -> String {
+        title
+            .replacingOccurrences(of: "…", with: "")
+            .trimmingCharacters(in: .whitespacesAndNewlines)
     }
 
     private func isSettingsOwnedPanel(_ window: NSWindow) -> Bool {
@@ -1150,9 +1425,18 @@
                   let closingWindow = notification.object as? NSWindow,
                   closingWindow == self.settingsWindow
             else { return }
+            let shouldRefocusOverlay = self.isOverlayVisible
+            let preferredScreen = self.overlayWindow?.screen
             self.detachSettingsWindow(closingWindow)
             self.settingsWindow = nil
-            self.refreshLauncherChromeState()
+            self.refreshLauncherChromeState(
+                activate: shouldRefocusOverlay && !self.overlayAvoidsSpaceSwitch,
+                avoidSpaceSwitch: self.overlayAvoidsSpaceSwitch
+            )
+            guard shouldRefocusOverlay else { return }
+            DispatchQueue.main.asyncAfter(deadline: .now() + 0.12) { [weak self] in
+                self?.showOrFocusOverlay(preferredScreen: preferredScreen)
+            }
         }
     }
 
@@ -1184,6 +1468,13 @@
     }
 
     private func promoteOverlayToForegroundInput() {
+        if overlayAvoidsSpaceSwitch {
+            refreshLauncherChromeState(activate: false, avoidSpaceSwitch: true)
+            guard let overlayWindow else { return }
+            overlayWindow.makeKeyAndOrderFront(nil)
+            overlayWindow.orderFrontRegardless()
+            return
+        }
         beginLauncherForegroundOwnership()
         guard let overlayWindow else { return }
         overlayWindow.makeKeyAndOrderFront(nil)
@@ -1264,9 +1555,28 @@
         }
     }
 
+    private func observeExternalActivationRequests() {
+        DistributedNotificationCenter.default().addObserver(
+            self,
+            selector: #selector(handleExternalActivationRequest(_:)),
+            name: Self.externalActivationNotification,
+            object: Self.externalActivationObject
+        )
+    }
+
+    @objc private func handleExternalActivationRequest(_ notification: Notification) {
+        let shouldShowOverlay = notification.userInfo?["showOverlay"] as? Bool ?? true
+        guard shouldShowOverlay else { return }
+        showOrFocusOverlay()
+    }
+
     @objc private func openPreferences(_ sender: Any? = nil) {
         TagDatabase.flushPendingCategorySchemeBackupBatch()
-        beginLauncherForegroundOwnership()
+        if overlayAvoidsSpaceSwitch {
+            refreshLauncherChromeState(activate: false, avoidSpaceSwitch: true)
+        } else {
+            beginLauncherForegroundOwnership()
+        }
         // Don't hide overlay — keep it visible for real-time setting preview.
         if let overlayWindow, overlayWindow.isVisible {
             overlayWindow.makeKeyAndOrderFront(nil)

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