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Merge pull request #2224: unpack-trees: enable fscache for sparse-che…
…ckout When updating the skip-worktree bits in the index to align with new values in a sparse-checkout file, Git scans the entire working directory with lstat() calls. In a sparse-checkout, many of these lstat() calls are for paths that do not exist. Enable the fscache feature during this scan. In a local test of a repo with ~2.2 million paths, updating the index with `git read-tree -m -u HEAD` with a sparse-checkout file containing only `/.gitattributes` improved from 2-3 minutes to 15-20 seconds. More work could be done to stop running lstat() calls when recursing into directories that are known to not exist.
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