* lisp/faces.el (faces--attribute-at-point): Fix an issue

Previous code would signal an error when the face at point was
a manually built list of attributes such as '(:foregroud "white").

* test/automated/faces-tests.el (faces--test-color-at-point): Add a test

2 files changed, 10 insertions, 1 deletions

diff --git a/lisp/faces.el b/lisp/faces.el
index f96df057cbd..d612461239e 100644
--- a/lisp/faces.el
+++ b/lisp/faces.el
@@ -1971,7 +1971,11 @@ unnamed faces (e.g, `foreground-color')."
                         (get-char-property (point) 'font-lock-face))
                    (get-char-property (point) 'face)))
         (found nil))
-    (dolist (face (if (listp faces) faces (list faces)))
+    ;; The attribute might be a face, a list of faces, or a list of
+    ;; attributes that make a face.  Normalize it to a list of faces.
+    (dolist (face (if (and (listp faces) (facep (car faces)))
+                      faces
+                    (list faces)))
       (cond (found)
             ((and face (symbolp face))
              (let ((value (face-attribute-specified-or
diff --git a/test/automated/faces-tests.el b/test/automated/faces-tests.el
index 007bc805120..ff9dfc53fbe 100644
--- a/test/automated/faces-tests.el
+++ b/test/automated/faces-tests.el
@@ -38,6 +38,11 @@
     (should (equal (background-color-at-point) "black"))
     (should (equal (foreground-color-at-point) "black")))
   (with-temp-buffer
+    (insert (propertize "STRING" 'face '(:foreground "black" :background "black")))
+    (goto-char (point-min))
+    (should (equal (background-color-at-point) "black"))
+    (should (equal (foreground-color-at-point) "black")))
+  (with-temp-buffer
     (emacs-lisp-mode)
     (setq-local font-lock-comment-face 'faces--test1)
     (setq-local font-lock-constant-face 'faces--test2)