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This bug concerns the way `import_refs` that gets called by `fetch` computes the heads that should be visible after the import. Previously, the list of such heads was computed *before* local branches were updated based on changes to the remote branches. So, commits that should have been abandoned based on this update of the local branches weren't properly abandoned. Now, `import_refs` tracks the heads that need to be visible because of some ref in a mapping keyed by the ref. If the ref moves or is deleted, the corresponding heads are updated. Fixes #864