Speeding up vc-dired still more

[Eric S. Raymond]

Dan Nicolaescu <address@hidden>:
> That will show  1000 calls to vc-bzr-registered, vc-git-registered,
> vc-arch-registered, vc-svn-registered etc etc.

Not any more.  I've added a check against
completion-ignored-extensions, encapsulated in a new function called
vc-dired-ignorable-p.
-- 
                <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>

Rifles, muskets, long-bows and hand-grenades are inherently democratic
weapons.  A complex weapon makes the strong stronger, while a simple
weapon -- so long as there is no answer to it -- gives claws to the
weak.
        -- George Orwell, "You and the Atom Bomb", 1945