I know how to edit a contract file, but what command should be used with that?
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1In Loki, at least, there is already the option "Set As Desktop Background" in the context menu that does this. Works with jpg and png files anyway. – Jeremy Wootten Feb 26 '17 at 8:44
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1You can find the corresponding contract in /usr/share/contractor. – Jeremy Wootten Feb 26 '17 at 8:48