I can get a Turtle window working outside the free_layout/nested_splitter 
framework. The graphics window is a separate window, as expected.

But I'm stumped at how the widget returned from ns_provide eventually gets 
a parent.  I don't see that happening in the NestedSplitter class.  For 
instance, in either ns.replace_widget or ns. replace_widget_at_index.  Well 
actually, there are calls to setParent(None), but why would that help?

Without a parent I don't understand how the Turtle widget will ever become 


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