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由 Paul Mackerras 提交于
If there is a GCA for the parents of the merge, then a file is interesting if some parent has a version that is different from both the child and the GCA. If there is no GCA (e.g. for a merge that pulls in an external project) then a file is interesting if the child's version is different from all of the parents. Next step is to actually show the differences for the interesting files...
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