Release 3.8.2.2: macOS Dock icon turns sea-wave N when connected.

Swap application icon on connect/disconnect via AppKit; ship arm64 build.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/dockicon/dockicon_darwin.go

@@ -0,0 +1,106 @@
+//go:build darwin
+
+package dockicon
+
+import (
+	_ "embed"
+	"log"
+	"sync"
+	"unsafe"
+
+	"github.com/ebitengine/purego"
+	"github.com/ebitengine/purego/objc"
+)
+
+//go:embed icon_idle.png
+var iconIdlePNG []byte
+
+//go:embed icon_connected.png
+var iconConnectedPNG []byte
+
+var (
+	once     sync.Once
+	ready    bool
+	mu       sync.Mutex
+	last     *bool
+	selSet   objc.SEL
+	selPerf  objc.SEL
+	selShared objc.SEL
+	selData  objc.SEL
+	selAlloc objc.SEL
+	selInit  objc.SEL
+	selRetain objc.SEL
+	clsApp   objc.Class
+	clsData  objc.Class
+	clsImage objc.Class
+)
+
+func initAppKit() {
+	once.Do(func() {
+		if _, err := purego.Dlopen("/System/Library/Frameworks/Foundation.framework/Foundation", purego.RTLD_GLOBAL|purego.RTLD_NOW); err != nil {
+			log.Printf("dockicon: Foundation: %v", err)
+			return
+		}
+		if _, err := purego.Dlopen("/System/Library/Frameworks/AppKit.framework/AppKit", purego.RTLD_GLOBAL|purego.RTLD_NOW); err != nil {
+			log.Printf("dockicon: AppKit: %v", err)
+			return
+		}
+		clsApp = objc.GetClass("NSApplication")
+		clsData = objc.GetClass("NSData")
+		clsImage = objc.GetClass("NSImage")
+		if clsApp == 0 || clsData == 0 || clsImage == 0 {
+			log.Printf("dockicon: missing AppKit classes")
+			return
+		}
+		selShared = objc.RegisterName("sharedApplication")
+		selSet = objc.RegisterName("setApplicationIconImage:")
+		selPerf = objc.RegisterName("performSelectorOnMainThread:withObject:waitUntilDone:")
+		selData = objc.RegisterName("dataWithBytes:length:")
+		selAlloc = objc.RegisterName("alloc")
+		selInit = objc.RegisterName("initWithData:")
+		selRetain = objc.RegisterName("retain")
+		ready = true
+	})
+}
+
+// SetConnected swaps the Dock icon: sea-wave N when connected, original when idle.
+func SetConnected(connected bool) {
+	initAppKit()
+	if !ready {
+		return
+	}
+	mu.Lock()
+	if last != nil && *last == connected {
+		mu.Unlock()
+		return
+	}
+	v := connected
+	last = &v
+	mu.Unlock()
+
+	png := iconIdlePNG
+	if connected {
+		png = iconConnectedPNG
+	}
+	if len(png) == 0 {
+		return
+	}
+
+	data := objc.ID(clsData).Send(selData, unsafe.Pointer(&png[0]), len(png))
+	if data == 0 {
+		return
+	}
+	img := objc.ID(clsImage).Send(selAlloc)
+	img = img.Send(selInit, data)
+	if img == 0 {
+		return
+	}
+	img.Send(selRetain) // keep alive across async main-thread call
+
+	app := objc.ID(clsApp).Send(selShared)
+	if app == 0 {
+		return
+	}
+	// AppKit must run on the main thread (glaze owns it).
+	app.Send(selPerf, selSet, img, false)
+}