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Using the --state-branch option allows us to perform incremental filtering. This may lead to having nothing to rewrite in subsequent filtering, so we need a way to recognize this case. So, let's exit with 2 instead of 1 when this "error" occurs. Signed-off-by: Michele Locati <michele@locati.it> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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