Migrating from SexyUrlLabel to GtkLabel
GTK+ 2.18 supports showing links inside a #GtkLabel, similar to
SexyUrlLabel. Porting from SexyUrlLabel to GtkLabel is relatively
straightforward. GtkLabel accepts links in the markup using the
same HTML a notation that SexyUrlLabel uses. In addition
to the href attribute, GtkLabel accepts a title attribute that
is displayed as a tooltip on the link. Instead of
sexy_url_label_set_markup(), just call gtk_label_set_markup().
One difference between the two APIs is that the ::url-activated signal
from SexyUrlLabel has been replaced by the #GtkLabel::activate-link
signal. The need for connecting to this signal is greatly reduced,
since GtkLabel has a default handler that calls gtk_show_uri().