rebase: use plumbing to show dirty state
Commit 4cfbe06f introduced the use of "git diff" to show dirty state in a format more familiar to users. However, it should have used the plumbing "git diff-files" instead. Not only is it good practice in general to use plumbing in scripts, but in this case we really don't want the automatic pager to kick in for an error message. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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