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由 Junio C Hamano 提交于
This updates the way diffcore represents an unmerged pair somewhat. It used to be that entries with mode=0 on both sides were used to represent an unmerged pair, but now it has an explicit flag. This is to allow diff-index --cached to report the entry from the tree when the path is unmerged in the index. This is used in updating "git reset <tree> -- <path>" to restore absense of the path in the index from the tree. Signed-off-by: NJunio C Hamano <junkio@cox.net>
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