Tooltip overflows in arc graph
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- JavaScript
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Description
The tooltips for arc graphs does not seem to take into account the right side of the graph like non-arc graphs do.
https://codepen.io/anon/pen/oKZOqQ
Overflow:

Moved to left:

Is there any reason the `tooltipRight` is not calculated and taken into account for arc graphs?
https://github.com/c3js/c3/blob/master/src/tooltip.js#L179
Thanks a lot!
* **C3 version**: 0.7.3
* **D3 version**: 5.9.2
* **Browser**: Chrome 75.0
* **OS**: macOS Mojave 10.14.5
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