vc-resynch-window

vc-resynch-window is a compiled Lisp function in `vc-dispatcher.el'.

(vc-resynch-window FILE &optional KEEP NOQUERY RESET-VC-INFO)

If FILE is in the current buffer, either revert or unvisit it.
The choice between revert (to see expanded keywords) and unvisit
depends on KEEP. NOQUERY if non-nil inhibits confirmation for
reverting. NOQUERY should be t *only* if it is known the only
difference between the buffer and the file is due to
modifications by the dispatcher client code, rather than user
editing!