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Implement a way of calculating deltas automatically for line-api widgets, by comparing the previous render with a new render. This would relieve the developer from having to calculate the changed regions.
Currently you can refresh parts of a widget by calculating the changed regions. This places a burden of calculating the changed regions on the developer. It would be convenient if there was a way of calculating deltas automatically, by comparing the previous render with a new render. We would need to be able to do this relatively efficiently.