d8e876b721
Recovery copies are unsaved documents. FolderStore made its folders with create_dir_all, so on Unix they got the default mode and other accounts on the machine could read the copies. Folders the store creates are now 0o700. A store folder that already exists (it can be one picked in Preferences) keeps its mode; the area made inside it is owner-only. The same change as storytold/pdfcraft#3320.