[BUG] Polygon simplification may produce invalid polygons

[JaffaKetchup]

What is the bug?

Some Polygons are not simplified correctly, and result in a polygon formed from less than 3 points. This results in long straight lines appearing on the map.

How can we reproduce it?

Any polygons which are small enough to be reduced down to less than 3 points should cause the issue.

Do you have a potential solution?

Either avoid displaying polygons with less than 3 points, or prevent the simplification from returning invalid polygons.

Platforms

All

Severity

Obtrusive: Prevents normal functioning but causes no errors in the console

[mootw]

one thing to add is that previously polygon simplification did not create "bad" polygons. Sometimes it makes sense to render long thin polygons as a single line (or even a single point for roughly round shaped polygons!). rendering less polygons can help with performance, but ive found that not rendering polygons of less than 2 leads to a feeling of pop-in, especially with higher simplification values.