In chasing down the bug documented in gtk-draco-980306-0.patch.README, I found
the gtk_object_check_class_cast routine to be insufficiently robust, it was
tossing me cores when it was just supposed to be warning me of trouble, so
here the fix I developed for that. Please note that it requires my
gtk-draco-980305-0.patch to have been installed prior (and also cleans up the
code on that slightly).
  Deon Ramsey (Draco)
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