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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: display-supports-face-attributes-p bug?
Date: Fri, 10 Jun 2005 18:36:32 -0400
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I installed a feature to make it possible for term/*.el to say
that the terminal does not really support underlining.
It is not elegant but it should do the job.

I also changed the underline face as follows:

(defface underline '((((supports :underline t))
		      :underline t)
		     (((supports :weight bold))
		      :weight bold)
		     (t :underline t))
  "Basic underlined face."
  :group 'basic-faces)

I think this is the right way for such faces to work.
It seems to work, but I have not installed it yet.