I'd like to separate my ui Swing/JOGL from the content, so my code is
relatively unaware of the UI around it.  For example, I create a
global context that holds on my content.  I then make a UI that when
the user does some interaction like a mouse click or drag, the UI
creates a new context.  My OO instincts would be to create a context
and pass it to all my UI objects that receive events and mutate them,
but if I'm dealing with an immutable class if I pass it to each UI
object, when one UI object makes a new context, it isn't reflected in
the other UIs.  Basically I want all UIs pointing to the same context
and each UI being able to create a new context that each UI points
to.  It seems that when one UI updates the global context reference
with a 'def', the others are still using the old one.

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