A GtkLinkButton is a Button with a hyperlink, similar to the one used by web browsers,
which triggers an action when clicked.
It is useful to show quick links to resources.
A link button is created by calling either LinkButton or
LinkButton.with_label. If using the former, the URI
you pass to the constructor is used as a label for the widget.
The URI bound to a GtkLinkButton can be set specifically using set_uri, and
retrieved using get_uri.
By default, GtkLinkButton calls show_uri_on_window when the button is
clicked. This behaviour can be overridden by connecting to the
activate_link signal and returning true from the signal handler.
GtkLinkButton has a single CSS node with name button. To differentiate it from a plain Button
, it gets the .link style class.