Fix setting stipple via `set-face-stipple'

* lisp/faces.el (face-valid-attribute-values): Return results
for `:stipple' in correct format.

diff --git a/lisp/faces.el b/lisp/faces.el
index 395ea315bae5086ca444c98562bb027dd087b732..1ada05a7b8bf17009d5caa726d04e5af7dc883bb 100644 (file)
--- a/lisp/faces.el
+++ b/lisp/faces.el
@@ -1203,7 +1203,8 @@ an integer value."
             'integerp)
            (:stipple
             (and (memq (window-system frame) '(x ns pgtk haiku)) ; No stipple on w32
-                 (mapcar #'list
+                 (mapcar (lambda (item)
+                           (cons item item))
                          (apply #'nconc
                                 (mapcar (lambda (dir)
                                           (and (file-readable-p dir)