It looks like the image viewer app has leaked override redirect windows.
Although that suggests to me it's still running?
If you run 'xwininfo -all' and then click on the artifacts, does it
reveal where they come from?
** Package changed: xorg (Ubuntu) => gnome-shell (Ubuntu)
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/2078901
Title:
Persistent Thumbnail Artifact Appears on Desktop When Opening Images
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