From: Juanma Barranquero <lekktu@gmail.com>
Date: Tue, 5 Jun 2007 10:12:37 +0000 (+0000)
Subject: (face-id): If the argument is a face alias, return the ID of the target face.
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(face-id): If the argument is a face alias, return the ID of the target face.
---

diff --git a/lisp/faces.el b/lisp/faces.el
index a8c92ab9a75..048dae039ad 100644
--- a/lisp/faces.el
+++ b/lisp/faces.el
@@ -222,11 +222,12 @@ Value is FACE."
 
 (defun face-id (face &optional frame)
   "Return the internal ID of face with name FACE.
+If FACE is a face-alias, return the ID of the target face.
 The optional argument FRAME is ignored, since the internal face ID
 of a face name is the same for all frames."
   (check-face face)
-  (get face 'face))
-
+  (or (get face 'face)
+      (face-id (get face 'face-alias))))
 
 (defun face-equal (face1 face2 &optional frame)
   "Non-nil if faces FACE1 and FACE2 are equal.