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由 Brandon Casey 提交于
Teach append_signoff to detect whether a blank line exists at the position that the signed-off-by line will be added, and refrain from adding an additional one if one already exists. Or, add an additional line if one is needed to make sure the new footer is separated from the message body by a blank line. Signed-off-by: NBrandon Casey <bcasey@nvidia.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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