(vc-svn-diff): Revert previous change but add a test

for newvars is nil. (C-u C-x v = with default values).

1 files changed, 13 insertions, 0 deletions

diff --git a/lisp/vc-svn.el b/lisp/vc-svn.el
index c2d0d62ab6c..e79ef9a0fa6 100644
--- a/lisp/vc-svn.el
+++ b/lisp/vc-svn.el
@@ -483,6 +483,19 @@ or svn+ssh://."
 
 (defun vc-svn-diff (files &optional oldvers newvers buffer)
   "Get a difference report using SVN between two revisions of fileset FILES."
+  (and oldvers
+       (not newvers)
+       files
+       (catch 'no
+         (dolist (f files)
+           (or (equal oldvers (vc-working-revision f))
+               (throw 'no nil)))
+         t)
+       ;; Use nil rather than the current revision because svn handles
+       ;; it better (i.e. locally).  Note that if _any_ of the files
+       ;; has a different revision, we fetch the lot, which is
+       ;; obviously sub-optimal.
+       (setq oldvers nil))
   (let* ((switches
             (if vc-svn-diff-switches
                 (vc-switches 'SVN 'diff)