A trashed folder keeps its path in the index, so a new folder can take
the same one. The descendant lookup behind move, delete, restore and
purge matched on space and path only: purging the trashed folder took
the live folder and its descendants out of the index, and moving the
live folder carried the trashed tree along.
Both engines now also match the root's trash state; purge with
onlyDeleted keeps matching the trashed ones only.
André Duffeck
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