The program below gets an error
Unknown signal realize for object of type at /usr/lib/perl5/Glib.pm line 211.
where I hoped it would print "realized something".
I wonder if signal_add_emission_hook() has to cope with lazy loading of
types or something. Calling the commented-out find_property() just as a
dummy first seems to drag in whatever's needed to make it work.
use strict;
use warnings;
use Gtk2 '-init';
# Gtk2::Widget->find_property ('name');
Gtk2::Widget->signal_add_emission_hook
(realize => sub { print "realized something\n"; });
my $toplevel = Gtk2::Window->new ('toplevel');
$toplevel->show_all;
Gtk2->main;
exit 0;
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