Derived types of GnomeCanvas

[Jon Trowbridge <trow emccta com>]

In Guppi, I've got a widget that is derived from the GnomeCanvas.
The trick is that I have to be sure that the canvas is an anti-aliased
one.

After inspecting gnome-canvas.c, I figured out to put

  GNOME_CANVAS(my_widget)->aa = 1;

into my_widget_init().

This works, but is there an officially sanctioned way of doing this
that I missed?  What are the odds of this trick continuing to
work with future versions of the libgnomeui?

-JT

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