Ah, fixed the stalling: logic error in the test program itself.

redo/zz_test.go

@@ -14,14 +14,15 @@ var closeOnClick = flag.Bool("close", false, "close on click")
 // because Cocoa hates being run off the main thread, even if it's run exclusively off the main thread
 func init() {
 	flag.Parse()
-	go Do(func() {
+	go func() {
+		done := make(chan struct{})
+		Do(func() {
 			w := NewWindow("Hello", 320, 240)
 			b := NewButton("There")
 			w.SetControl(b)
 			if *closeOnClick {
 				b.SetText("Click to Close")
 			}
-		done := make(chan struct{})
 			w.OnClosing(func() bool {
 				if *closeOnClick {
 					panic("window closed normally in close on click mode (should not happen)")
@@ -31,6 +32,7 @@ func init() {
 				done <- struct{}{}
 				return true
 			})
+			// GTK+ TODO: this is causing a resize event to happen afterward?!
 			b.OnClicked(func() {
 				println("in OnClicked()")
 				if *closeOnClick {
@@ -40,8 +42,9 @@ func init() {
 				}
 			})
 			w.Show()
-		<-done
 		})
+		<-done
+	}()
 	err := Go()
 	if err != nil {
 		panic(err)