Commit a4ad7bed authored by Basil L. Contovounesios's avatar Basil L. Contovounesios

Fix off-by-one-link error in image--set-property

* lisp/image.el (image--set-property): Ensure new value is set even
in the unlikely case that the plist is empty.  Fix off-by-one-link
error when deleting a property. (bug#35285)
* test/lisp/image-tests.el: New file.
(image--set-property): New test.
parent a1c53d42
Pipeline #1335 passed with stage
in 26 minutes and 15 seconds
......@@ -452,10 +452,10 @@ Internal use only."
;; plist. Decouple plist entries where the key matches
;; the property.
(if (eq (cadr image) property)
(setcdr image (cddr image))
(setcdr image (cdddr image))
(setq image (cddr image))))
;; Just enter the new value.
(plist-put (cdr image) property value))
(setcdr image (plist-put (cdr image) property value)))
value)
(defun image-property (image property)
......
;;; image-tests.el --- tests for image.el -*- lexical-binding: t -*-
;; Copyright (C) 2019 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Code:
(require 'ert)
(require 'image)
(ert-deftest image--set-property ()
"Test `image--set-property' behavior."
(let ((image (list 'image)))
;; Add properties.
(setf (image-property image :scale) 1)
(should (equal image '(image :scale 1)))
(setf (image-property image :width) 8)
(should (equal image '(image :scale 1 :width 8)))
(setf (image-property image :height) 16)
(should (equal image '(image :scale 1 :width 8 :height 16)))
;; Delete properties.
(setf (image-property image :type) nil)
(should (equal image '(image :scale 1 :width 8 :height 16)))
(setf (image-property image :scale) nil)
(should (equal image '(image :width 8 :height 16)))
(setf (image-property image :height) nil)
(should (equal image '(image :width 8)))
(setf (image-property image :width) nil)
(should (equal image '(image)))))
;;; image-tests.el ends here
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