1 files changed, 6 insertions, 4 deletions

diff --git a/lisp/vc/diff-mode.el b/lisp/vc/diff-mode.el
index 9f0fa584b0d..8f4b59f9e53 100644
--- a/lisp/vc/diff-mode.el
+++ b/lisp/vc/diff-mode.el
@@ -146,7 +146,7 @@ when editing big diffs)."
                ;; but not all since they may hide useful M-<foo> global
                ;; bindings when editing.
                (set-keymap-parent map diff-mode-shared-map)
-               (dolist (key '("A" "r" "R" "g" "q" "W"))
+               (dolist (key '("A" "r" "R" "g" "q" "W" "z"))
                  (define-key map key nil))
                map))
     ;; From compilation-minor-mode.
@@ -815,9 +815,11 @@ PREFIX is only used internally: don't use it."
             (diff-find-file-name old noprompt (match-string 1)))
        ;; if all else fails, ask the user
        (unless noprompt
-         (let ((file (read-file-name (format "Use file %s: "
-                                             (or (first fs) ""))
-                                     nil (first fs) t (first fs))))
+         (let ((file (expand-file-name (or (first fs) ""))))
+           (setq file
+                 (read-file-name (format "Use file %s: " file)
+                                 (file-name-directory file) file t
+                                 (file-name-nondirectory file)))
            (set (make-local-variable 'diff-remembered-files-alist)
                 (cons (cons fs file) diff-remembered-files-alist))
            file))))))