Currently, xfdesktop repeats images in a list when a user runs the following command: $ DISPLAY=:0.0 /usr/bin/xfdesktop --reload An enhancement would be for it keep track of which images in the list were displayed and not repeat an image until every image in the entire list has been displayed once.
As I re-read what I wrote, I thought it was a bit lacking on details. Try #2: Xfdesktop does not keep track of which images in a list are displayed. The result is that some images in a list get displayed frequently while others are rarely displayed. A more robust implementation of the random background feature should randomly displaying an image in the list and not repeat it until all list members have been displayed.
I wrote a script that does this behavior: https://github.com/graysky2/backdrop-randomizer
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