feat: play alert sound for unavailable thumbnail shortcuts

src/logic/Application.swift

@@ -125,9 +125,16 @@ class Application: NSObject {
         }
     }
 
+    func canBeQuit() -> Bool {
+        return runningApplication.bundleIdentifier != "com.apple.finder" || Preferences.finderShowsQuitMenuItem
+    }
+
     func quit() {
         // only let power users quit Finder if they opt-in
-        if runningApplication.bundleIdentifier == "com.apple.finder" && !Preferences.finderShowsQuitMenuItem { return }
+        if !canBeQuit() {
+            NSSound.beep()
+            return
+        }
         if alreadyRequestedToQuit {
             runningApplication.forceTerminate()
         } else {

src/logic/Window.swift

@@ -101,8 +101,15 @@ class Window {
         }
     }
 
+    func canBeClosed() -> Bool {
+        return !isWindowlessApp
+    }
+
     func close() {
-        if isWindowlessApp { return }
+        if !canBeClosed() {
+            NSSound.beep()
+            return
+        }
         BackgroundWork.accessibilityCommandsQueue.asyncWithCap { [weak self] in
             guard let self = self else { return }
             if self.isFullscreen {
@@ -114,8 +121,15 @@ class Window {
         }
     }
 
+    func canBeMinDeminOrFullscreened() -> Bool {
+        return !isWindowlessApp && !isTabbed
+    }
+
     func minDemin() {
-        if isWindowlessApp { return }
+        if !canBeMinDeminOrFullscreened() {
+            NSSound.beep()
+            return
+        }
         BackgroundWork.accessibilityCommandsQueue.asyncWithCap { [weak self] in
             guard let self = self else { return }
             if self.isFullscreen {
@@ -132,7 +146,10 @@ class Window {
     }
 
     func toggleFullscreen() {
-        if isWindowlessApp { return }
+        if canBeMinDeminOrFullscreened() {
+            NSSound.beep()
+            return
+        }
         BackgroundWork.accessibilityCommandsQueue.asyncWithCap { [weak self] in
             guard let self = self else { return }
             self.axUiElement.setAttribute(kAXFullscreenAttribute, !self.isFullscreen)
@@ -164,7 +181,7 @@ class Window {
         }
     }
 
-    // The following function was ported from https://github.com/Hammerspoon/hammerspoon/issues/370#issuecomment-545545468
+    /// The following function was ported from https://github.com/Hammerspoon/hammerspoon/issues/370#issuecomment-545545468
     func makeKeyWindow(_ psn: ProcessSerialNumber) -> Void {
         var psn_ = psn
         var bytes1 = [UInt8](repeating: 0, count: 0xf8)

src/ui/main-window/ThumbnailView.swift

@@ -78,9 +78,9 @@ class ThumbnailView: NSStackView {
             var yOffset = CGFloat(2 + ThumbnailView.windowsControlSize)
             [quitIcon, closeIcon, minimizeIcon, maximizeIcon].forEach { icon in
                 icon.isHidden = !shouldShow ||
-                    ((window_?.isWindowlessApp ?? true) && icon.type != .quit) ||
-                    (icon.type == .quit && window_?.application.runningApplication.bundleIdentifier == "com.apple.finder" && !Preferences.finderShowsQuitMenuItem) ||
-                    ((icon.type == .miniaturize || icon.type == .fullscreen) && (window_?.isTabbed ?? true))
+                    (icon.type == .quit && !(window_?.application.canBeQuit() ?? true)) ||
+                    (icon.type == .close && !(window_?.canBeClosed() ?? true)) ||
+                    ((icon.type == .miniaturize || icon.type == .fullscreen) && !(window_?.canBeMinDeminOrFullscreened() ?? true))
                 if !icon.isHidden {
                     icon.setFrameOrigin(NSPoint(
                         x: xOffset,