* lisp/vc/vc.el (vc-find-revision-no-save): Use decode-coding-inserted-region

and after-insert-file-set-coding.  Don't let-bind coding-system-for-read
and coding-system-for-write.  For non-interactive use, let-bind
enable-local-variables to :safe and ignore errors from set-auto-mode call.
(Bug#33567)

1 files changed, 19 insertions, 14 deletions

diff --git a/lisp/vc/vc.el b/lisp/vc/vc.el
index 5ff9f4d5be6..48b7c98dfac 100644
--- a/lisp/vc/vc.el
+++ b/lisp/vc/vc.el
@@ -2033,20 +2033,25 @@ Unlike `vc-find-revision-save', doesn't save the buffer to the file."
       (with-current-buffer filebuf
         (let ((failed t))
           (unwind-protect
-              (let ((coding-system-for-read 'no-conversion)
-                    (coding-system-for-write 'no-conversion))
-                (with-current-buffer (or buffer (create-file-buffer filename))
-                  (unless buffer (setq buffer-file-name filename))
-                  (let ((outbuf (current-buffer)))
-                    (with-current-buffer filebuf
-                      (if backend
-                          (vc-call-backend backend 'find-revision file revision outbuf)
-                        (vc-call find-revision file revision outbuf))))
-                  (goto-char (point-min))
-                  (if buffer (let ((buffer-file-name file)) (normal-mode)) (normal-mode))
-                  (set-buffer-modified-p nil)
-                  (setq buffer-read-only t))
-                (setq failed nil))
+              (with-current-buffer (or buffer (create-file-buffer filename))
+                (unless buffer (setq buffer-file-name filename))
+                (let ((outbuf (current-buffer)))
+                  (with-current-buffer filebuf
+                    (if backend
+                        (vc-call-backend backend 'find-revision file revision outbuf)
+                      (vc-call find-revision file revision outbuf))))
+                (decode-coding-inserted-region (point-min) (point-max) file)
+                (after-insert-file-set-coding (- (point-max) (point-min)))
+                (goto-char (point-min))
+                (if buffer
+                    ;; For non-interactive, skip any questions
+                    (let ((enable-local-variables :safe) ;; to find `mode:'
+                          (buffer-file-name file))
+                      (ignore-errors (set-auto-mode)))
+                  (normal-mode))
+                (set-buffer-modified-p nil)
+                (setq buffer-read-only t))
+                (setq failed nil)
             (when (and failed (unless buffer (get-file-buffer filename)))
               (with-current-buffer (get-file-buffer filename)
                 (set-buffer-modified-p nil))