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Nested control flow
For #162
This works ok on given example and bquote but :
- tweak background color for a better look
- clean up flow_data, the logic should live in another function
- check how this affects flow_run etc
- the left right arrow doesn't always look nice/is not visible enough in png output, so we should explore emojis or alternatives
- I think we do need special casing for functions for the display to be nicer, use
function()for anonymous functions. - implement recursive boxes
- the way we implement data$nodes is not satisfying and will likely break the recursive boxes, should find a better way