$ perl clipboard.pl
$tpath --> ARRAY(0x9f46000)
$tp --> Gtk3::TreePath=SCALAR(0x9f45ff0)
$col0content --> Seznam.cz
$col1content --> http://www.seznam.cz/
*** unhandled exception in callback:
***   Cannot convert scalar a4a8bf0 to an object of type Gtk3::Gdk::Atom at clipboard.pl line 86.
***  ignoring at /usr/share/perl5/vendor_perl/Gtk3.pm line 321.