gtk:stack-add-titled (stack child name title)

stack -- a gtk:stack widget
child -- a gtk:widget child widget to add
name -- a string with the name for the child page
title -- a string with a human readable title for the child page

Adds a child page to the stack. The child page is identified by name. The title will be used by the gtk:stack-switcher widget to represent the child page in a tab bar, so it should be short.