Add workaround for turf.intersect which can't deal with touching polygons

Logic/GeoOperations.ts

@@ -357,7 +357,6 @@ export class GeoOperations {
      * Returns null if the features are not intersecting
      */
     private static calculateInstersection(feature, otherFeature, featureBBox: BBox, otherFeatureBBox?: BBox): number {
-        try {
             if (feature.geometry.type === "LineString") {
 
 
@@ -427,19 +426,25 @@ export class GeoOperations {
                     return this.calculateInstersection(otherFeature, feature, otherFeatureBBox, featureBBox)
                 }
 
+                try{
+                    
                 const intersection = turf.intersect(feature, otherFeature);
                 if (intersection == null) {
                     return null;
                 }
                 return turf.area(intersection); // in m²
+                }catch(e){
+                    if(e.message === "Each LinearRing of a Polygon must have 4 or more Positions."){
+                        // WORKAROUND TIME!
+                        // See https://github.com/Turfjs/turf/pull/2238
+                        return null;
+                    }
+                    throw e;    
+                }
 
             }
+            throw "CalculateIntersection fallthrough: can not calculate an intersection between features"
 
-        } catch (exception) {
-            console.warn("EXCEPTION CAUGHT WHILE INTERSECTING: ", exception,"\nThe considered objects are",feature, otherFeature);
-            return undefined
-        }
-        return undefined;
     }
 
     /**

package.json

@@ -59,11 +59,11 @@
   "license": "GPL",
   "dependencies": {
     "@babel/preset-env": "7.13.8",
-    "@turf/buffer": "^6.3.0",
-    "@turf/collect": "^6.3.0",
-    "@turf/distance": "^6.3.0",
-    "@turf/length": "^6.3.0",
-    "@turf/turf": "^6.3.0",
+    "@turf/buffer": "^6.5.0",
+    "@turf/collect": "^6.5.0",
+    "@turf/distance": "^6.5.0",
+    "@turf/length": "^6.5.0",
+    "@turf/turf": "^6.5.0",
     "@types/jquery": "^3.5.5",
     "@types/leaflet-markercluster": "^1.0.3",
     "@types/leaflet-providers": "^1.2.0",

test/GeoOperations.spec.ts

@@ -3,6 +3,7 @@ import {equal} from "assert";
 import T from "./TestHelper";
 import {GeoOperations} from "../Logic/GeoOperations";
 import {BBox} from "../Logic/BBox";
+import * as turf from "@turf/turf"
 
 export default class GeoOperationsSpec extends T {
 
@@ -187,7 +188,7 @@ export default class GeoOperationsSpec extends T {
                 ],
                 ["Regression test: intersection/overlap", () => {
 
-                    const polyGrb ={
+                    const polyGrb = {
                         "type": "Feature",
                         "properties": {
                             "osm_id": "25189153",
@@ -351,10 +352,15 @@ export default class GeoOperationsSpec extends T {
                         }
                     }
 
+                    const p0 = turf.polygon(polyGrb.geometry.coordinates)
+                    Assert.notEqual(p0, null)
+                    const p1 = turf.polygon(polyHouse.geometry.coordinates)
+                    Assert.notEqual(p1, null)
+                    
                     const overlaps = GeoOperations.calculateOverlap(polyGrb, [polyHouse])
-                    Assert.equal(overlaps.length, 1)
-                    const overlapsRev= GeoOperations.calculateOverlap(polyHouse, [polyGrb])
-                    Assert.equal(overlaps.length, 1)
+                    Assert.equal(overlaps.length, 0)
+                    const overlapsRev = GeoOperations.calculateOverlap(polyHouse, [polyGrb])
+                    Assert.equal(overlapsRev.length, 0)
 
                 }]
             ]

test/TestHelper.ts

@@ -1,9 +1,9 @@
 export default class T {
 
     public readonly name: string;
-    private readonly _tests: [string, (() => void)][];
+    private readonly _tests: [string, (() => (void | Promise<void>))][];
 
-    constructor(testsuite: string, tests: [string, () => void][]) {
+    constructor(testsuite: string, tests: [string, () => (Promise<void> | void)][]) {
         this.name = testsuite
         this._tests = tests;
     }
@@ -60,7 +60,14 @@ export default class T {
         const failures: { testsuite: string, name: string, msg: string } [] = []
         for (const [name, test] of this._tests) {
             try {
-                test();
+                const r = test()
+                if (r instanceof Promise) {
+                    r.catch(e => {
+                        console.log("ASYNC ERROR: ", e, e.stack)
+                        failures.push({testsuite: this.name, name: name, msg: "" + e});
+                    });
+                }
+
             } catch (e) {
                 console.log("ERROR: ", e, e.stack)
                 failures.push({testsuite: this.name, name: name, msg: "" + e});