I end up having a bunch of *.orig files sitting around, from hg reverts. It's annoying when I find myself editing foo.c.orig instead of foo.c by mistake. (I use ido-mode and the first match is not always the shortest.)
Is there a way to tell Emacs to ignore *.orig files as though they were *~ files? I'm not having much luck with google -- I've found a million pages telling me how to change where it saves its own backup files, but not how to ignore others.