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Use all base snapshots in determine_wants()

vlorentz requested to merge generated-differential-D7831-source into generated-differential-D7831-target

Before this commit, determine_wants() used the origin's last snapshot if any, or the closest parent's snapshot if not.

However, we noticed that many repositories that are very slow to load are forks that were already visited, but their owner rebased it on the parent since the last visit, causing potentially many commits to be added to the origin.

This ensures we do not needlessly fetch these new commits when we already loaded the parent.

Resolves #4219 (closed).

Test Plan

The existing tests cover this, because I simply replaced code that made snapshot selection too specific.

Migrated from D7831 (view on Phabricator)

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