Gtk2 has a powerful, but complex MVC (Model, View, Controller) system
used to implement list and tree widgets. Gtk2::Ex::Simple::List
automates the complex setup work and allows you to treat the list model
as a more natural list of lists structure.
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WWW: http://search.cpan.org/dist/Gtk2-Ex-Simple-List/
Author: Ross McFarland <rmcfarla@neces.com>
Justification: needed by x11-toolkits/p5-Gtk-Ex-PodViewer