[MERGE] is_ignored improvements...

[Robert Collins]

I've had some further thoughts on this optimisation...

I think we might get better performance still if we grouped the basename
only matches into one regex:

Rather than translating
["foo", "foo/bad", "bar*"] into

"((?:.*/)?(?!.*/)foo$)|((?:.*/)?(?!.*/)bar.*$)|(foo/bad$)"

if we translated that as
"(?:(?:.*/)?(?!.*/)(?:(foo)|(bar.*))|(foo/bad))$"

it would mean there is only one negative lookahead assertion in the
entire group. This will require reordering of the ignore rules to
combine them like this, but I think thats worth it (as a second step
optimisation).

Rob

-- 
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