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diffcore-break: don't divide by zero
When the source file is empty, the calculation of the merge score results in a division by zero. In the situation: == preimage == == postimage == F (empty file) F (a large file) E (a new empty file) it does not make sense to consider F->E as a rename, so it is better not to break the pre- and post-image of F. Bail out early in this case to avoid hitting the divide-by-zero. This causes the merge score to be left at zero. Signed-off-by: John Keeping <firstname.lastname@example.org> Signed-off-by: Junio C Hamano <email@example.com>
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