Too large fitBounds padding throws Unsupported operation: Infinity or NaN toInt

[kengu]

There is currently no upper bound on how large the padding can be compared to the MapState.size. This results in an negative number in the actual size used to calculate scaled zoom.

When calling MapController.fitBounds this ultimately throws an unexpected Unsupported operation: Infinity or NaN toInt in CustomPoint.floor.

Proposed resolution
Add lower bound on actual size in method MapState.getBoundsZoom, as proposed on line 219 below:

218: var size = this.size - padding;
219: size = CustomPoint(math.max(0, size.x), math.max(0, size.y));

This solution is tested already and resolves the issue. I'll post an PR soon.

[kengu]

Probably related to #409.