Creates a #GtkMenu and populates it with menu items and
submenus according to @model.
The created menu items are connected to actions found in the
#GtkApplicationWindow to which the menu belongs - typically
by means of being attached to a widget (see gtk_menu_attach_to_widget())
that is contained within the #GtkApplicationWindows widget hierarchy.
Actions can also be added using gtk_widget_insert_action_group() on the menu's
attach widget or on any of its parent widgets.
Creates a #GtkMenu and populates it with menu items and submenus according to @model.
The created menu items are connected to actions found in the #GtkApplicationWindow to which the menu belongs - typically by means of being attached to a widget (see gtk_menu_attach_to_widget()) that is contained within the #GtkApplicationWindows widget hierarchy.
Actions can also be added using gtk_widget_insert_action_group() on the menu's attach widget or on any of its parent widgets.