Sets the name of an icon to show inside the menu button.
Setting icon name resets gtk.menu_button.MenuButton.utf8 and gtk.menu_button.MenuButton.Widget.
If propertyGtk.MenuButton:always-show-arrow is set to TRUE and gtk.menu_button.MenuButton.ArrowType is not gtk.types.ArrowType.None, a dropdown arrow will be shown next to the icon.
the icon name
Sets the name of an icon to show inside the menu button.
Setting icon name resets gtk.menu_button.MenuButton.utf8 and gtk.menu_button.MenuButton.Widget.
If propertyGtk.MenuButton:always-show-arrow is set to TRUE and gtk.menu_button.MenuButton.ArrowType is not gtk.types.ArrowType.None, a dropdown arrow will be shown next to the icon.