Decisions taken for simplicity:
1) For now, `--pathspec-from-file` is declared incompatible with
`--interactive/--patch`, even when <file> is not `stdin`. Such use
case it not really expected. Also, it would require changes to
`interactive_add()`.
2) It is not allowed to pass pathspec in both args and file.
Signed-off-by: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
