Added menu cloning.

Introduced the ability to clone a menu, along with its submenus, in Linux-based web applications to create a full deep copy. This fixes reusing the application menu for window menus.

v3/pkg/application/webview_window_linux.go

@@ -37,14 +37,6 @@ type linuxWebviewWindow struct {
 	gtkmenu      pointer
 }
 
-func (w *linuxWebviewWindow) setMinimiseButtonEnabled(enabled bool) {
-	// Not available in Linux
-}
-
-func (w *linuxWebviewWindow) setMaximiseButtonEnabled(enabled bool) {
-	// Not available in Linux
-}
-
 var (
 	registered bool = false // avoid 'already registered message' about 'wails://'
 )
@@ -276,7 +268,7 @@ func (w *linuxWebviewWindow) run() {
 		w.gtkmenu = (menu.impl).(*linuxMenu).native
 	}
 
-	w.window, w.webview, w.vbox = windowNew(app.application, menu, w.parent.id, w.parent.options.Linux.WebviewGpuPolicy)
+	w.window, w.webview, w.vbox = windowNew(app.application, w.gtkmenu, w.parent.id, w.parent.options.Linux.WebviewGpuPolicy)
 	app.registerWindow(w.window, w.parent.id) // record our mapping
 	w.connectSignals()
 	if w.parent.options.EnableDragAndDrop {