Add an activatable widget to the action area of a #GtkInfoBar,
connecting a signal handler that will emit the #GtkInfoBar::response
signal on the message area when the widget is activated. The widget
is appended to the end of the message areas action area.
Add an activatable widget to the action area of a #GtkInfoBar, connecting a signal handler that will emit the #GtkInfoBar::response signal on the message area when the widget is activated. The widget is appended to the end of the message areas action area.