From 12b42b71d4ef50cfd4aec56b62cfc25954b3c99d Mon Sep 17 00:00:00 2001
From: "Richard M. Stallman" <rms@gnu.org>
Date: Mon, 16 May 2005 03:31:32 +0000
Subject: [PATCH] (help-face-def): New button type.

---
 lisp/help-mode.el | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lisp/help-mode.el b/lisp/help-mode.el
index 8b0284089fc..d94f03200dc 100644
--- a/lisp/help-mode.el
+++ b/lisp/help-mode.el
@@ -169,6 +169,18 @@ The format is (FUNCTION ARGS...).")
 		     (goto-char (cdr location))))
   'help-echo (purecopy"mouse-2, RET: find variable's definition"))
 
+(define-button-type 'help-face-def
+  :supertype 'help-xref
+  'help-function (lambda (fun file)
+		   (require 'find-func)
+		   ;; Don't use find-function-noselect because it follows
+		   ;; aliases (which fails for built-in functions).
+		   (let ((location
+			  (find-function-search-for-symbol fun 'defface file)))
+		     (pop-to-buffer (car location))
+		     (goto-char (cdr location))))
+  'help-echo (purecopy "mouse-2, RET: find face's definition"))
+
 
 ;;;###autoload
 (defun help-mode ()
-- 
2.39.2