get_icon_name

Returns the icon name of the button.

If the icon name has not been set with [method@Gtk.Button.set_icon_name] the return value will be null. This will be the case if you create an empty button with [ctor@Gtk.Button.new] to use as a container.

Parameters:

this	A `GtkButton`

Returns:

The icon name set via [method@Gtk.Button.set_icon_name]