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I deleted and later re-created the Documents folder in my home directory. It no longer appears in the Files quicklist. You can see in the screen shot below that several bookmarks are present among the home directories, but Documents is not there anymore. I can add and remove bookmarks in Nautilus and they appear and disappear from the quicklist, which is the expected behaviour.
How do I restore the original functionality such that existing default user directories (Desktop, Documents, Music, etc...) are listed in the Files quicklist along with dynamically added Nautilus bookmarks?
I know I can create a custom quicklist for Files by manually creating and editing a .desktop file
~/.local/share/applications/nautilus, but this gives me a static quicklist (which may not pick up newly added Nautilus bookmarks?).
A note about the default user directories - once deleted, re-creating them is not the same as if the originals were left in place. The new folder icons are generic (easily fixed) and an edit has to be made to
~/.config/user-dirs.dirs to restore them to Nautilus' Places menu, but I cannot figure out how to get them back in the Files quicklist.