* vc-hooks.el (vc-dir-buffers): New var.

* vc-hooks.el (vc-dir-buffers): New var.
(vc-state-refresh): New function.
(vc-state): Use it.
(vc-after-save): Always ask the backend to recompute the new state.
Always call vc-dir if necessary, using vc-dir-buffers.
* vc-dir.el (vc-dir-prepare-status-buffer, vc-dir-resynch-file):
Use vc-dir-buffers.
(vc-dir-mode): Use vc-dir-buffers rather than after-save-hook.
(vc-dir-prepare-status-buffer, vc-dir-update)
(vc-dir-resync-directory-files, vc-dir-resynch-file, vc-dir-mode):
Don't call expand-file-name on default-directory.