Make menus to be displayed on Windows OS in v3\examples\dialogs (#4928)

* fix: make menus to be displayed on Windows OS in `v3\examples\dialogs`

* refactor: use cross-platform user home dir in `v3/examples/dialogs/main.go`

* fix: handle os.UserHomeDir() error with fallback to os.TempDir()

* fix: use = instead of := for err (already declared)

---------

Co-authored-by: Lea Anthony <lea.anthony@gmail.com>

v3/UNRELEASED_CHANGELOG.md

@@ -25,6 +25,7 @@ After processing, the content will be moved to the main changelog and this file
 <!-- Bug fixes -->
 - Fix potential panic when setting empty icon or bitmap on Linux (#4923) by @ddmoney420
 - Fix ErrorDialog crash when called from service binding on macOS (#3631) by @leaanthony
+- Make menus to be displayed on Windows OS in `v3\examples\dialogs` by @ndianabasi
 
 ## Deprecated
 <!-- Soon-to-be removed features -->

v3/examples/dialogs/main.go

@@ -27,7 +27,14 @@ func main() {
 
 	// Create a custom menu
 	menu := app.NewMenu()
-	menu.AddRole(application.AppMenu)
+
+	// macOS: Add application menu
+	if runtime.GOOS == "darwin" {
+		menu.AddRole(application.AppMenu)
+	}
+
+	// All platforms: Add standard menus
+	menu.AddRole(application.FileMenu)
 	menu.AddRole(application.EditMenu)
 	menu.AddRole(application.WindowMenu)
 	menu.AddRole(application.ServicesMenu)
@@ -332,12 +339,18 @@ func main() {
 			app.Dialog.Info().SetMessage(result).Show()
 		}
 	})
+
+	userHomeDir, err := os.UserHomeDir()
+	if err != nil || userHomeDir == "" {
+		userHomeDir = os.TempDir()
+	}
+
 	saveMenu.Add("Select File (Full Example)").OnClick(func(ctx *application.Context) {
 		result, _ := app.Dialog.SaveFile().
 			CanCreateDirectories(false).
 			ShowHiddenFiles(true).
 			SetMessage("Select a file").
-			SetDirectory("/Applications").
+			SetDirectory(userHomeDir).
 			SetButtonText("Let's do this!").
 			SetFilename("README.md").
 			HideExtension(true).
@@ -350,11 +363,15 @@ func main() {
 		}
 	})
 
-	app.Menu.Set(menu)
+	window := app.Window.New()
 
-	app.Window.New()
+	if runtime.GOOS == "darwin" {
+		app.Menu.Set(menu)
+	} else {
+		window.SetMenu(menu)
+	}
 
-	err := app.Run()
+	err = app.Run()
 
 	if err != nil {
 		log.Fatal(err.Error())