Skip path resolution without ignored directories - #374
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Prepared macOS and Windows aggregation roots resolve every child path even when the ignored-directory list is empty. Path resolution checks for symbolic links and therefore adds one filesystem lookup per root. Share the existing traversal predicate with both aggregation input paths. Its empty-list short circuit skips path resolution, and prepared roots use borrowed filenames without allocating paths.
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Prepared macOS and Windows aggregation roots resolve every child path even when the ignored-directory list is empty. Path resolution checks for symbolic links and therefore adds one filesystem lookup per root.
Share the existing traversal predicate with both aggregation input paths. Its empty-list short circuit skips path resolution, and prepared roots use borrowed filenames without allocating paths.
This reduces duplication and fixes a tiny missed optimization from f9b6200.