fix: plug some minor memory leaks

src/api-wrappers/CGWindowID.swift

@@ -19,7 +19,7 @@ extension CGWindowID {
         // CGSHWCaptureWindowList
         var windowId_ = self
         let options: CGSWindowCaptureOptions = [.captureIgnoreGlobalClipShape, .windowCaptureNominalResolution]
-        let list = CGSHWCaptureWindowList(cgsMainConnectionId, &windowId_, 1, options) as! [CGImage]
+        let list = CGSHWCaptureWindowList(cgsMainConnectionId, &windowId_, 1, options).takeRetainedValue() as! [CGImage]
         return list.first
 
 //        // CGWindowListCreateImage

src/api-wrappers/PrivateApis.swift

@@ -36,7 +36,7 @@ func CGSMainConnectionID() -> CGSConnectionID
 // * offscreen content: no
 // * macOS 10.10+
 @_silgen_name("CGSHWCaptureWindowList")
-func CGSHWCaptureWindowList(_ cid: CGSConnectionID, _ windowList: inout CGWindowID, _ windowCount: UInt32, _ options: CGSWindowCaptureOptions) -> CFArray
+func CGSHWCaptureWindowList(_ cid: CGSConnectionID, _ windowList: inout CGWindowID, _ windowCount: UInt32, _ options: CGSWindowCaptureOptions) -> Unmanaged<CFArray>
 
 // returns the connection ID for the provided window
 // * macOS 10.10+

src/logic/events/KeyboardEvents.swift

@@ -21,7 +21,6 @@ private func observe_() {
                 callback: keyboardHandler,
                 userInfo: nil)
         let runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0)
-        CGEvent.tapEnable(tap: eventTap!, enable: true)
         CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, .commonModes)
         CFRunLoopRun()
     }

src/ui/main-window/ThumbnailTitleView.swift

@@ -12,6 +12,7 @@ class ThumbnailTitleView: BaseLabel {
         textContainer.lineFragmentPadding = 0
         layoutManager.addTextContainer(textContainer)
         self.init(NSRect.zero, textContainer)
+        font = Preferences.font
         self.magicOffset = magicOffset
         textColor = Preferences.fontColor
         shadow = ThumbnailView.makeShadow(.darkGray)

src/ui/main-window/ThumbnailView.swift

@@ -8,8 +8,8 @@ class ThumbnailView: NSStackView {
     var minimizedIcon = ThumbnailFontIconView(ThumbnailFontIconView.sfSymbolCircledMinusSign, Preferences.fontIconSize, .white)
     var hiddenIcon = ThumbnailFontIconView(ThumbnailFontIconView.sfSymbolCircledDotSign, Preferences.fontIconSize, .white)
     var spaceIcon = ThumbnailFontIconView(ThumbnailFontIconView.sfSymbolCircledNumber0, Preferences.fontIconSize, .white)
-    var mouseDownCallback: MouseDownCallback!
-    var mouseMovedCallback: MouseMovedCallback!
+    var mouseDownCallback: (() -> Void)!
+    var mouseMovedCallback: (() -> Void)!
     var dragAndDropTimer: Timer?
 
     convenience init() {
@@ -22,7 +22,7 @@ class ThumbnailView: NSStackView {
         observeDragAndDrop()
     }
 
-    func updateRecycledCellWithNewContent(_ element: Window, _ mouseDownCallback: @escaping MouseDownCallback, _ mouseMovedCallback: @escaping MouseMovedCallback, _ newHeight: CGFloat, _ screen: NSScreen) {
+    func updateRecycledCellWithNewContent(_ element: Window, _ index: Int, _ newHeight: CGFloat, _ screen: NSScreen) {
         window_ = element
         if thumbnail.image != element.thumbnail {
             thumbnail.image = element.thumbnail
@@ -40,11 +40,9 @@ class ThumbnailView: NSStackView {
         let labelChanged = label.string != element.title
         if labelChanged {
             label.string = element.title
-            // workaround: setting string on NSTextView change the font (most likely a Cocoa bug)
-            label.font = Preferences.font
         }
-        assignIfDifferent(&hiddenIcon.isHidden, !window_!.isHidden)
-        assignIfDifferent(&minimizedIcon.isHidden, !window_!.isMinimized)
+        assignIfDifferent(&hiddenIcon.isHidden, !element.isHidden)
+        assignIfDifferent(&minimizedIcon.isHidden, !element.isMinimized)
         assignIfDifferent(&spaceIcon.isHidden, element.spaceIndex == nil || Spaces.isSingleSpace || Preferences.hideSpaceNumberLabels)
         if !spaceIcon.isHidden {
             if element.isOnAllSpaces {
@@ -58,8 +56,8 @@ class ThumbnailView: NSStackView {
         let fontIconWidth = CGFloat([minimizedIcon, hiddenIcon, spaceIcon].filter { !$0.isHidden }.count) * (Preferences.fontIconSize + Preferences.intraCellPadding)
         assignIfDifferent(&label.textContainer!.size.width, frame.width - Preferences.iconSize - Preferences.intraCellPadding * 3 - fontIconWidth)
         assignIfDifferent(&subviews.first!.frame.size, frame.size)
-        self.mouseDownCallback = mouseDownCallback
-        self.mouseMovedCallback = mouseMovedCallback
+        self.mouseDownCallback = { () -> Void in App.app.focusSelectedWindow(element) }
+        self.mouseMovedCallback = { () -> Void in Windows.updateFocusedWindowIndex(index) }
         if trackingAreas.count == 0 {
             addTrackingArea(NSTrackingArea(rect: bounds, options: [.mouseMoved, .activeAlways], owner: self, userInfo: nil))
         } else if trackingAreas.count > 0 && trackingAreas[0].rect != bounds {
@@ -73,6 +71,27 @@ class ThumbnailView: NSStackView {
         }
     }
 
+    private func test5(index: Int) {
+        self.mouseMovedCallback = { () -> Void in Windows.updateFocusedWindowIndex(index) }
+    }
+
+    private func test4(element: Window) {
+        self.mouseDownCallback = { () -> Void in App.app.focusSelectedWindow(element) }
+    }
+
+    private func test3() {
+        assignIfDifferent(&subviews.first!.frame.size, frame.size)
+    }
+
+    private func test2(fontIconWidth: CGFloat) {
+        assignIfDifferent(&label.textContainer!.size.width, frame.width - Preferences.iconSize - Preferences.intraCellPadding * 3 - fontIconWidth)
+    }
+
+    private func test1() -> CGFloat {
+        let fontIconWidth = CGFloat([minimizedIcon, hiddenIcon, spaceIcon].filter { !$0.isHidden }.count) * (Preferences.fontIconSize + Preferences.intraCellPadding)
+        return fontIconWidth
+    }
+
     private func observeDragAndDrop() {
         // NSImageView instances are registered to drag-and-drop by default
         thumbnail.unregisterDraggedTypes()
@@ -174,5 +193,3 @@ class ThumbnailView: NSStackView {
     }
 }
 
-typealias MouseDownCallback = () -> Void
-typealias MouseMovedCallback = () -> Void

src/ui/main-window/ThumbnailsView.swift

@@ -51,10 +51,7 @@ class ThumbnailsView: NSVisualEffectView {
             guard App.app.appIsBeingUsed else { return }
             guard window.shouldShowTheUser else { continue }
             let view = ThumbnailsView.recycledViews[index]
-            view.updateRecycledCellWithNewContent(window,
-                { () -> Void in App.app.focusSelectedWindow(window) },
-                { () -> Void in Windows.updateFocusedWindowIndex(index) },
-                height, screen)
+            view.updateRecycledCellWithNewContent(window, index, height, screen)
             let width = view.frame.size.width
             if (currentX + width).rounded(.down) > widthMax {
                 currentX = CGFloat(0)

src/ui/preferences-window/tabs/GeneralTab.swift

@@ -146,7 +146,7 @@ class GeneralTab: NSViewController, PreferencePane {
             }
         }
         if (sender as! NSButton).state == .on {
-            LSSharedFileListInsertItemURL(loginItems, kLSSharedFileListItemBeforeFirst.takeRetainedValue(), nil, nil, itemUrl, nil, nil)
+            let _ = LSSharedFileListInsertItemURL(loginItems, kLSSharedFileListItemBeforeFirst.takeRetainedValue(), nil, nil, itemUrl, nil, nil).takeRetainedValue()
         }
     }
 }