There were several points where we looked at the HEAD
commit; for initial commits, this is meaningless. So instead
we:
- show staged status data as a diff against the empty tree
instead of HEAD
- show file diffs as creation events
- use "git rm --cached" to revert instead of going back to
the HEAD commit
We magically reference the empty tree to implement this.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
