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work very well, except to a forced C<write_only> target so that it's not
read back.

=item *

C<widget#screen> uses the C<get_screen()> method.  This means it will give
the default screen until the widget is added to a toplevel C<Gtk2::Window>
or similar to determine the screen.

C<widget#screen> is read-only for most widgets, but is writable for anything
with a C<set_screen()> such as C<Gtk2::Menu>.  There's a plain C<screen>
property on C<Gtk2::Window> so it doesn't need this special
C<widget#screen>, but other widgets benefit.

C<Gtk2::Gdk::Screen> is new in Gtk 2.2 and C<widget#screen> and
C<widget#has-screen> are not available in Gtk 2.0.x.

=item *

C<widget#state> is the C<state()> / C<set_state()> condition, such as
"normal" or "prelight".