Avoid updating registry when adding existing deps #3144
Merged
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Cargo previously erroneously updated the registry whenever a new dependency was
added on a crate which already exists in the DAG. This commit fixes this
behavior by ensuring that if the new dependency matches a previously locked
version it uses that instead.
This commit involved a bit of refactoring around this logic to be a bit more
clear how the locking and "falling back to the registry" is happening.
Closes #2895