gtk:info-bar-add-action-widget (infobar child response)

infobar -- a gtk:info-bar widget
child -- an activatable widget
response -- an integer with the response ID for child

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