cvs-mode-diff could grok vc-cvs-stay-local

[Kai Großjohann]

I am in the train, my CVS repository is remote.  I edit a file in a
cvs working directory.  I can then do `C-x v =' on the file and it
will happily show me a diff.  But doing M-x cvs-quickdir RET and then
`=' on the file from the *cvs* buffer complains that cvs couldn't
talk to the server.

WIBNI `=' would work in this case?

(I'm sorry I can't work on this.)
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