createPolygonWithAttenuatedThreshold should use this instead of selecting the polygon class from polygonBackends

[dev7355608]

What happened?

MyCustomPointSourcePolygon.createPolygonWithAttenuatedThreshold() should use MyCustomPointSourcePolygon and not the one that is set in polygonBackends.

  static createPolygonWithAttenuatedThreshold(origin, config) {

    // Determine the number of threshold walls and, of those, which, if any, require attenuation.
-   const polygonBackend = CONFIG.Canvas.polygonBackends[config.source.constructor.sourceType];
+   const polygonBackend = this;

What ways of accessing Foundry can you encounter this issue in?

• Native App (Electron)
• Chrome
• Firefox
• Safari
• Other

Reproduction Steps

.

What core version are you reporting this for?

Version 11 Prototype 2 (build 293)

Relevant log output

No response

Bug Checklist

• The issue occurs while all Modules are disabled