Don't move point in vc-dir on vc-register/vc-checkin (bug#43188)

* lisp/vc/vc-dir.el (vc-dir-update):
  Save and restore point on 'ewoc-invalidate'.
* lisp/vc/vc-dispatcher.el (vc-finish-logentry):
  Don't call 'vc-dir-move-to-goal-column'.
* lisp/vc/vc.el (vc-register): Don't call 'vc-dir-move-to-goal-column'.

lisp/vc/vc-dir.el

@@ -451,7 +451,11 @@ If NOINSERT, ignore elements on ENTRIES which are not in the ewoc."
 		      (setf (vc-dir-fileinfo->state (ewoc-data node)) (nth 1 entry))
 		      (setf (vc-dir-fileinfo->extra (ewoc-data node)) (nth 2 entry))
 		      (setf (vc-dir-fileinfo->needs-update (ewoc-data node)) nil)
-		      (ewoc-invalidate vc-ewoc node))
+                      ;; `ewoc-invalidate' will kill line and insert new text,
+                      ;; let's keep point column.
+                      (let ((p (point)))
+		        (ewoc-invalidate vc-ewoc node)
+                        (goto-char p)))
 		  ;; If the state is nil, the file does not exist
 		  ;; anymore, so remember the entry so we can remove
 		  ;; it after we are done inserting all ENTRIES.

lisp/vc/vc-dispatcher.el

@@ -691,7 +691,6 @@ BACKEND, if non-nil, specifies a VC backend for the Log Edit buffer."
 	(message "%s  Type C-c C-c when done" msg)
       (vc-finish-logentry (eq comment t)))))
 
-(declare-function vc-dir-move-to-goal-column "vc-dir" ())
 ;; vc-finish-logentry is typically called from a log-edit buffer (see
 ;; vc-start-logentry).
 (defun vc-finish-logentry (&optional nocomment)
@@ -740,8 +739,6 @@ the buffer contents as a comment."
       (mapc
        (lambda (file) (vc-resynch-buffer file t t))
        log-fileset))
-    (when (vc-dispatcher-browsing)
-      (vc-dir-move-to-goal-column))
     (run-hooks after-hook 'vc-finish-logentry-hook)))
 
 (defun vc-dispatcher-browsing ()

lisp/vc/vc.el

@@ -1346,8 +1346,6 @@ For old-style locking-based version control systems, like RCS:
        nil t)))))
   (vc-call-backend backend 'create-repo))
 
-(declare-function vc-dir-move-to-goal-column "vc-dir" ())
-
 ;;;###autoload
 (defun vc-register (&optional vc-fileset comment)
   "Register into a version control system.
@@ -1398,8 +1396,6 @@ first backend that could register the file is used."
 
        (vc-resynch-buffer file t t))
      files)
-    (when (derived-mode-p 'vc-dir-mode)
-      (vc-dir-move-to-goal-column))
     (message "Registering %s... done" files)))
 
 (defun vc-register-with (backend)