Comment 7 for bug 209870

It seems matchbox xsettings support is actually mostly unrelated; it's useful to have it, but not required. It will listen to these settings:
    { "Net/ThemeName", XSET_THEME },
    { "MATCHBOX/THEME", XSET_THEME },
    { "MATCHBOX/CURSOR", XSET_CURSOR },
    { "MATCHBOX/TITLEBARS", XSET_TITLEBARS }, /* XXX Not implemeted */
    { "MATCHBOX/COMPOSITE", XSET_COMPOSITE },
    { "Gtk/CursorThemeName", XSET_CURSOR_THEME_NAME },
    { "Gtk/CursorThemeSize", XSET_CURSOR_THEME_SIZE },

The first one is likely interesting and the last two perhaps to some extent; we probably don't need the other ones.

Anyway, this shouldn't prevent switching themes for all practical purposes, it will just get us a nicer mwm.