X-Git-Url: http://cgit.sxemacs.org/?p=gnus;a=blobdiff_plain;f=lisp%2Fgnus-util.el;h=6759c0715b79ee6f427a14217b4c82b43ecda1a6;hp=40e2dcf92fdd858ce9689fcac296e6c3165b759a;hb=ac9f01c45db8c08ffa835bbcdc2662ed14f40a73;hpb=386e4d3ea54d4898bd5c7447991a116a1ef2c11f

diff --git a/lisp/gnus-util.el b/lisp/gnus-util.el
index 40e2dcf92..6759c0715 100644
--- a/lisp/gnus-util.el
+++ b/lisp/gnus-util.el
@@ -1372,18 +1372,25 @@ Return the modified alist."
 
 (if (fboundp 'union)
     (defalias 'gnus-union 'union)
-  (defun gnus-union (l1 l2)
-    "Set union of lists L1 and L2."
+  (defun gnus-union (l1 l2 &rest keys)
+    "Set union of lists L1 and L2.
+If KEYS contains the `:test' and `equal' pair, use `equal' to compare
+items in lists, otherwise use `eq'."
     (cond ((null l1) l2)
 	  ((null l2) l1)
 	  ((equal l1 l2) l1)
 	  (t
 	   (or (>= (length l1) (length l2))
 	       (setq l1 (prog1 l2 (setq l2 l1))))
-	   (while l2
-	     (or (member (car l2) l1)
-		 (push (car l2) l1))
-	     (pop l2))
+	   (if (eq 'equal (plist-get keys :test))
+	       (while l2
+		 (or (member (car l2) l1)
+		     (push (car l2) l1))
+		 (pop l2))
+	     (while l2
+	       (or (memq (car l2) l1)
+		   (push (car l2) l1))
+	       (pop l2)))
 	   l1))))
 
 (declare-function gnus-add-text-properties "gnus"