Add `flat-button' to custom-face-attributes

* lisp/cus-face.el (custom-face-attributes): Add `flat-button'
(bug#45769).

diff --git a/lisp/cus-face.el b/lisp/cus-face.el
index 5dcb2842a2120c6d2117d96f2d4a9a6e329b137c..21fe89c621468e7b0cead3ad1f0b9de3e1cb4bdc 100644 (file)
--- a/lisp/cus-face.el
+++ b/lisp/cus-face.el
@@ -175,6 +175,7 @@
                   (choice :tag "Style"
                           (const :tag "Raised" released-button)
                           (const :tag "Sunken" pressed-button)
+                          (const :tag "Flat"   flat-button)
                           (const :tag "None" nil))))
      ;; filter to make value suitable for customize
      (lambda (real-value)