8f7b256665a3e6d154e8f1987e2b79c723c761ad
When doing list-unit-files with --root, we would re-read the preset list for every unit. This uses a cache to only do it once. The time for list-unit-files goes down by about ~30%. unit_file_query_preset() is also called from src/core/. This patch does not touch that path, since the saving there are smaller, since preset status is only read on demand over dbus, and caching would be more complicated.
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