Leave point at WORKING-REVISION, if it is non-nil.
If IS-START-REVISION is non-nil, start the log from WORKING-REVISION
\(not all backends support this); i.e., show only WORKING-REVISION and
-earlier revisions. Show up to LIMIT entries (non-nil means unlimited).
+earlier revisions. Show up to LIMIT entries (nil means unlimited).
LIMIT can also be a string, which means the revision before which to stop."
;; Don't switch to the output buffer before running the command,
;; so that any buffer-local settings in the vc-controlled