Fix download --constraint for legacy-resolver. #9301
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Download was not filtering out constraint-only requirements prior to attempting to save them. Add a failing test under `--resolver=legacy` and fix by adding in the filtering. See: pypa@b28e2c4#r45135982 Fixes pypa#9283
jsirois
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Dec 15, 2020
Previously, during dependency resolution for `pip download -d <dir>` or `pip wheel -w <dir>`, distributions downloaded are always saved to <dir>, even for those are only used in backtracking and are not part of the returned requirement set.
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Download was not filtering out constraint-only requirements prior to
attempting to save them. Add a failing test under
--resolver=legacyand fix by adding in the filtering.
See: b28e2c4#r45135982
Fixes #9283