[fix] #12048 - Add selfJoin option for doughnut graphs #12054
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Fixes #12048
I have created an option called ArcOptions.selfJoin for doughnut and pie graphs. This option is false as default but when set to true, it will allow datasets that take up 100% of the graph to self join. This effect is only visible when border is activated and removes the separation line between what is effectively the same arc. To achieve this effect I used some cropping similar to how border align inner is implemented.
What it looks like
Tests
I have created 2 new tests for this new feature.
Known limitations
It is not obvious how to smoothly animate this joining when the graph uses border radius, inner border align or border join style miter. Those are not supported.