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All the menu items in the Jackpot menu are indented as if to hold an icon, yet there are no icons on any menu items on this menu. So should use putValue("noIconInMenu", Boolean.TRUE) in initialize() method of the SystemAction, or constructor of the Action (see SA.iconResource Javadoc).
Not quite so simple for dynamic menus, as the dynamic menu has to use Actions.connect() instead of normal Swing API for "noIconInMenu" to be checked. Apparently, Jackpot has the first dynamic menus which don't have icon spacing!