refactor: fix non-impactful compiler warnings

src/logic/Application.swift

@@ -75,7 +75,7 @@ class Application: NSObject {
         if runningApplication.isFinishedLaunching && runningApplication.activationPolicy != .prohibited && axUiElement == nil {
             axUiElement = AXUIElementCreateApplication(pid)
             AXObserverCreate(pid, axObserverCallback, &axObserver)
-            debugPrint("Adding app", pid, runningApplication.bundleIdentifier ?? "nil")
+            debugPrint("Adding app", pid ?? "nil", runningApplication.bundleIdentifier ?? "nil")
             observeEvents()
         }
     }

src/logic/NSScreen.swift

@@ -32,7 +32,7 @@ extension NSScreen {
     //   * if NSScreen.screensHaveSeparateSpaces == false, and key window is on another screen than screens[0], it still returns screens[0]
     // we find the screen with the key window ourselves manually
     static func active() -> NSScreen? {
-        if let app = Applications.list.first { $0.pid == NSWorkspace.shared.frontmostApplication?.processIdentifier },
+        if let app = (Applications.list.first { $0.pid == NSWorkspace.shared.frontmostApplication?.processIdentifier }),
            let focusedWindow = app.focusedWindow {
             return NSScreen.screens.first { focusedWindow.isOnScreen($0) }
         }

src/logic/Windows.swift

@@ -25,7 +25,7 @@ class Windows {
     }
 
     static func setInitialFocusedWindowIndex() {
-        if let app = Applications.list.first { $0.pid == NSWorkspace.shared.frontmostApplication?.processIdentifier },
+        if let app = (Applications.list.first { $0.pid == NSWorkspace.shared.frontmostApplication?.processIdentifier }),
            app.focusedWindow == nil,
            let lastFocusedWindowIndex = getLastFocusedWindowIndex() {
             updateFocusedWindowIndex(lastFocusedWindowIndex)

src/logic/events/KeyboardEvents.swift

@@ -67,8 +67,9 @@ class KeyboardEvents {
     }
 
     private static func addLocalMonitorForKeyDownAndKeyUp() {
-        localMonitor = NSEvent.addLocalMonitorForEvents(matching: [.keyDown, .keyUp]) { event in
-            return handleEvent(nil, nil, event.type == .keyDown ? UInt32(event.keyCode) : nil, cocoaToCarbonFlags(event.modifierFlags), event.type == .keyDown ? event.isARepeat : false) ? nil : event
+        localMonitor = NSEvent.addLocalMonitorForEvents(matching: [.keyDown, .keyUp]) { (event: NSEvent) in
+            let someShortcutTriggered = handleEvent(nil, nil, event.type == .keyDown ? UInt32(event.keyCode) : nil, cocoaToCarbonFlags(event.modifierFlags), event.type == .keyDown ? event.isARepeat : false)
+            return someShortcutTriggered ? nil : event
         }
     }
 

src/ui/main-window/ThumbnailView.swift

@@ -178,6 +178,7 @@ class ThumbnailView: NSStackView {
         }
     }
 
+    @discardableResult
     func updateDockLabelIcon(_ dockLabel: Int?) -> Bool {
         assignIfDifferent(&dockLabelIcon.isHidden, dockLabel == nil || Preferences.hideAppBadges || Preferences.iconSize == 0)
         if !dockLabelIcon.isHidden, let dockLabel = dockLabel {