Unfortunately the drawing to the canvas is a third party sort-of code that we don't want to muck too deeply with.
It seems like there isn't a real way to create 2 views of the same data, so our best bet is to just create 2 of the canvas. This will give us the most functionality, and we have some preliminary tests that say the impact on memory footprint isn't bad enough for this not to work.
Thanks for the suggestions, I'll keep them in mind for future projects working with TK.
If someone does have a way to do it I'd still love to hear about it, but for now I think we have a method that might work.
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