(frame-delete-all): Copy the whole alist first.

[bpt/emacs.git] / lisp / frame.el

diff --git a/lisp/frame.el b/lisp/frame.el
index 0688b30..b529afc 100644 (file)
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -336,6 +336,7 @@ These supersede the values given in `default-frame-alist'.")
 ;; Delete from ALIST all elements whose car is KEY.
 ;; Return the modified alist.
 (defun frame-delete-all (key alist)
+  (setq alist (copy-sequence alist))
   (let ((tail alist))
     (while tail
       (if (eq (car (car tail)) key)