Use combining faces for highlighting.

[gnus] / lisp / gnus-compat.el

diff --git a/lisp/gnus-compat.el b/lisp/gnus-compat.el
index 2b25e45..3241cd1 100644 (file)
--- a/lisp/gnus-compat.el
+++ b/lisp/gnus-compat.el
@@ -104,6 +104,24 @@ TRASH is ignored."
     (and (boundp var)
         (symbol-value var))))
 
+
+;; Emacs less than 24.3
+(unless (fboundp 'add-face)
+  (defun add-face (beg end face)
+    "Combine FACE BEG and END."
+    (let ((b beg))
+      (while (< b end)
+       (let ((oldval (get-text-property b 'face)))
+         (put-text-property
+          b (setq b (next-single-property-change b 'face nil end))
+          'face (cond ((null oldval)
+                       face)
+                      ((and (consp oldval)
+                            (not (keywordp (car oldval))))
+                       (cons face oldval))
+                      (t
+                       (list face oldval)))))))))
+
 (provide 'gnus-compat)
 
 ;; gnus-compat.el ends here