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    #Draggability of window
my $adj = Gtk2::Adjustment->new (1.00, 0.05, 5.00, 0.05, 0.50, 0.50);
...
    my ($adj, $canvas) = @_;
    $canvas->set_pixels_per_unit ($adj->value);
}
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    Gdk-CRITICAL **: gdk_property_change: assertion `type != GDK_TARGET_ST
+RING' fail
ed at C:/camelbox/site/lib/Gtk2/Ex/SyncCall.pm line 62.