mate-desktop/mate-settings-daemon — pull request #31 by jasmineaura (2012-12-14 01:55:27+00:00)
Title: background revised

Now, really, the only standing issue regarding background handling is the following (obsoleted) issue:
https://bugzilla.gnome.org/show_bug.cgi?id=568588

Shouldn't be too difficult to do in m-s-d, given that the X manager selection already exists in Caja.
See: get_desktop_manager_selection() in src/caja-application.c