Sets whether response is enabled.
If response is not enabled, the corresponding button will have [property@Gtk.Widget:sensitive] set to `FALSE` and it can't
be activated as a default response.
response can still be used as [property@AlertDialog:close-response] while it's not enabled.
Responses are enabled by default.
| this |
an alert dialog |
| response |
a response ID |
| enabled |
whether to enable |