Test Glib::ParamSpec->value_validate on a Gtk2::Gdk::Region
Test Glib::ParamSpec->value_validate on a Gtk2::Gdk::Region

This tests that the recent change to Glib
(7b3d380d9b98e45a8a32fab3098ec7e64f60ad2f) actually works.

https://bugzilla.gnome.org/show_bug.cgi?id=635809

cpanxaoc/perl-Gtk2,cpanxaoc/perl-Gtk2,cpanxaoc/perl-Gtk2