Commits on Jan 6, 2021

1. Avoid downloading candidates of a same version …

   Since 41a3008, Candidate objects prepare their underlying
   distribution eagerly on creation, so the error can be caught
   deterministically to trigger backtracking.
   
   This however has a negative side-effect. Since dist preparation involves
   metadata validation, a remote distribution must be downloaded on
   Candidate creation. This means that an sdist will be downloaded,
   validated, and discarded (since its version is known to be incompatible)
   during backtracking.
   
   This commit moves version deduplication of candidates from indexes to
   before the Candidate object is created, to avoid unneeded preparation.
   
   Note that we still need another round of deduplication in FoundCandidates
   to remove duplicated candidates when a distribution is already installed.

   

   uranusjr committed Jan 6, 2021
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