GNU bug report logs - #4114
23.1; face doc unclear - no explanation of "underlying" face or attribute value

Previous Next

Full log

Message #10 received at 4114-done <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: "Drew Adams" <drew.adams <at> oracle.com>
Cc: 4114-done <at> debbugs.gnu.org
Subject: Re: 23.1; face doc unclear - no explanation of "underlying" face or attribute value
Date: Sat, 15 Aug 2009 17:15:52 -0400

> In (elisp)Face Attributes, things are explained in terms of
> "underlying" face. But this notion is never introduced or explained.

Thanks, I've tweaked the text and added a reference to the node
Displaying Faces, where the concept is explained.

> I have no idea what was intended in any of these passages.

Here's an experiment that should make this clear.  Go to the default
*scratch* buffer and evaluate the following lines, one at a time:

;; Give the comments in this buffer a height of 15.
(set-face-attribute 'font-lock-comment-face nil :height 150)
;; Give characters 5 to 8 a height that's 0.9 times that of the
;; underlying face, in this case font-lock-comment-face.
(setq ov (make-overlay 5 8))
(overlay-put ov 'face (list :height 0.9))

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.