This controls whether or not this menubar will be a top-level
bar similar to the way Macintosh handles menubars. This
overrides any global config settings.
Keep in mind that it is probably a really bad idea to use this
unless you really know what you're doing. A feature like a
top-level menubar is one that should really be shared by all
applications. If your app is the only one with a top-level
bar, then things might look very... odd.
This is included only for those people that do know that
they need to use it.
top_level - If set to true, then this menubar will be a
top-level menu
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