create-animated-image: Don't add heuristic mask to image (Bug#6839).

lisp/ChangeLog

+2010-08-18  Katsumi Yamaoka  <yamaoka@jpl.org>
+
+	* image.el (create-animated-image): Don't add heuristic mask to image
+	(Bug#6839).
+
 2010-08-18  Jan Djärv  <jan.h.d@swipnet.se>
 
 	* term/ns-win.el (ns-get-pasteboard, ns-set-pasteboard): Use

lisp/image.el

@@ -616,7 +616,7 @@ Images should not be larger than specified by `max-image-size'."
     (let* ((animate (memq type image-animated-types))
 	   (image
 	    (append (list 'image :type type (if data-p :data :file) file-or-data)
-		    (if animate '(:index 0 :mask heuristic))
+		    (if animate '(:index 0))
 		    props)))
       (if animate
 	  (image-animate-start image))