From: Johannes Altmanninger <aclopte@gmail.com>
Date: Mon, 14 Dec 2020 19:00:54 GMT
Subject: Unexpected behavior on diff -I<regex> --name-only
Message-ID: <20201214190054.lrdllbpf6jfrz573@gmail.com>

Since v2.28.0-2-g296d4a94e7 (diff: add -I<regex> that ignores matching changes)
diff -I<regex> can be used to suppress hunks of only matching lines.
This interacts in a surprising way with --name-only, which lists
all changed files, regardless of whether they are filtered out by -I<regex>:

	git diff HEAD~ -I ''			# always empty
	git diff HEAD~ -I '' --name-only	# not empty, "-I" does nothing

It could be nice to only show names of files with matching hunks
(or reject this combination of options?).