Would others find it useful to have most/all of the artist.Artist 
subclasses updated to use the new (weak-ref) cbook.CallbookRegistry 
callbacks?

I'm working on a tool to tweak matplotlib figure styles/colors, etc, 
and I find it very useful to selectively enable "auto-updating" in 
my own toolkit such that the figure is updated on each change that 
I make.  Although I'm able to do this in my own toolkit's wrapper 
layer, I would rather do it within matplotlib itself.

My thoughts are that at the least, I'd want parents to be able to 
subscribe to signals from children, and possibly vice-versa.  Then 
at the top, have the Figure optionally add it's draw() method as 
a callback to it's child axes/whatever instances.  

I'll probably start working on some patches for own use anyway, 
but if there's interest, I'll keep them polished/tested and 
submit them for review.




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