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由 Tzu-ping Chung 提交于
This rewrites how a SpecifierRequirement generates candidates, so it * Always return an AlreadyInstalledCandidate (as long as the version satisfies the specifier), even if PackageFinder does not return a candidate for the same version. * Always put the AlreadyInstalledCandidate last, so it's preferred over LinkCandidate, preventing version changes if possible.
cfac6aeb