I also had to (under KDE)
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Edit the settings for each of the folders in Dolphin (The file manager)
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Edit the location of the desktop folder in the settings found by right-clicking the desktop and going into “Configure Desktop and Wallpaper” Location.
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Edit the show item by choosing Custom Location, and adding the XDG directory for the desktop. This setting may not stick.
In before the XKCD reference!