* doc-view.el (doc-view-toggle-display): Perform rassq-delete-all

on a copy of auto-mode-alist, because that deletes with side
effects.

2 files changed, 8 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 3b28681fec5..e241a65ff50 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,11 @@
 2010-12-30  Tassilo Horn  <tassilo@member.fsf.org>
 
+        * doc-view.el (doc-view-toggle-display): Perform rassq-delete-all
+        on a copy of auto-mode-alist, because that deletes with side
+        effects.
+
+2010-12-30  Tassilo Horn  <tassilo@member.fsf.org>
+
         * doc-view.el (doc-view-mode, doc-view-toggle-display): Use
         normal-mode without doc-view-mode bindings in auto-mode-alist as
         fallback instead of hard coding fundamental mode.
diff --git a/lisp/doc-view.el b/lisp/doc-view.el
index 526bf7694fb..a5dbff10564 100644
--- a/lisp/doc-view.el
+++ b/lisp/doc-view.el
@@ -1061,7 +1061,8 @@ For now these keys are useful:
         ;; normal mode.
         (if doc-view-previous-major-mode
             (funcall doc-view-previous-major-mode)
-          (let ((auto-mode-alist (rassq-delete-all 'doc-view-mode auto-mode-alist)))
+          (let ((auto-mode-alist (rassq-delete-all 'doc-view-mode
+                                                   (copy-alist auto-mode-alist))))
             (normal-mode)))
         (doc-view-minor-mode 1))
     ;; Switch to doc-view-mode