Re: [PATCH] grep: error out if --untracked is used with --cached

Elijah Newren [off-list ref] writes:

...  Even then, I'd be tempted to say that
--untracked is only used in combination with a search of the working
tree.

I tend to agree.  Something like

  $ git grep -ne POISON maint master next seen -- t/test-lib.sh

would be a useful thing, but I do not see how --untracked would
usefully interact with any of these "tracked" contents, be the
search from the index or tree.