Implement vc-default-dir-extra-headers for vc-rcs

Add a do-nothing implementation for vc-rcs to suppress the message which
the default function adds to the vc-dir buffer (Bug#28570).
* lisp/vc/vc-rcs.el (vc-rcs-dir-extra-headers): New function.

diff --git a/lisp/vc/vc-rcs.el b/lisp/vc/vc-rcs.el
index db1addbecd2b6c63c1a80d294cd50707b9b2433a..84ab10b14fecb1438823fe6b80b12be548dd659b 100644 (file)
--- a/lisp/vc/vc-rcs.el
+++ b/lisp/vc/vc-rcs.el
@@ -177,6 +177,8 @@ For a description of possible values, see `vc-check-master-templates'."
          (push (list frel state) result))))
     (funcall update-function result)))
 
+(defun vc-rcs-dir-extra-headers (&rest _ignore))
+
 (defun vc-rcs-working-revision (file)
   "RCS-specific version of `vc-working-revision'."
   (or (and vc-consult-headers