Yes, that's xubuntu-specific: debian/patches/02_show_context_menu.patch contains this function. According to the changelog, it seems that with it xfdesktop context menu will show up if the user right-clicks anywhere on the desktop (versus only on an icon for a vanilla xfdesktop). So this cant' really be disabled without a loss of feature...
Yes, that's xubuntu-specific: debian/ patches/ 02_show_ context_ menu.patch contains this function. According to the changelog, it seems that with it xfdesktop context menu will show up if the user right-clicks anywhere on the desktop (versus only on an icon for a vanilla xfdesktop). So this cant' really be disabled without a loss of feature...