Introducing 'unrecognized and 'ignored

[Eric S. Raymond]

I've spent the last couple of hours looking at this issue.
A reminder: the payoff for getting it right would be another 
significant speedup in (vc-dired-hook), which would translate to 
a faster C-x v d display.

Remarkably, it looks as if the code does not actually depend
in any significant way on the nil return from (vc-state file) meaning
that FILE is unregistered.  Tests that might have used this method
use vc-backend instead.  So introducing an 'unregistered state 
shouldn't actually break anything.

Alex Harsanyi: A cvs-ignorable-file-p would actually be useful, if
you're still interested. Under later systems it's faster to get this 
by doing a bit of estra parsing of rge status report.
-- 
                <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>

The kind of charity you can force out of people nourishes about as much as
the kind of love you can buy --- and spreads even nastier diseases.