bug#22144: --exclude no longer works against arguments with a directory name

[Paul Eggert]

Vincent Lefevre wrote:
> The documentation is still ambiguous. For the "main case", is this
> the canonical name as returned by realpath?
>
> > >As you say, the 2.22 behavior does not seem ideal.
> By doing a difference for subfiles of a recursive search, this is
> even worse!

Please try the attached patch, which I've installed into the savannah 
repository. It attempts to fix the behavior, and to clarify the documentation. 
It is a tricky area. Hope this helps.

0001-grep-exclude-matches-trailing-parts-of-args.patch
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