set_label
Description:
Sets the label to show inside the menu button.
Setting a label resets [property@Gtk.MenuButton:icon-name] and [property@Gtk.MenuButton:child].
If [property@Gtk.MenuButton:direction] is not `GTK_ARROW_NONE`, a dropdown arrow will be shown next to the label.
Parameters:
| this |
a `GtkMenuButton` |
| label |
the label |