Fix compatibility with Edge and bug in state init

Edge doesn't have path2d.addPath()
Checkbox state init didn't handle reading null from storage well

Author: qu1ck

InteractiveHtmlBom/web/ibom.js

@@ -104,12 +104,13 @@ function getStoredCheckboxRefs(checkbox) {
     }
   }
   if (!(checkbox in settings.checkboxStoredRefs)) {
-    settings.checkboxStoredRefs[checkbox] = readStorage("checkbox_" + checkbox);
+    var val = readStorage("checkbox_" + checkbox);
+    settings.checkboxStoredRefs[checkbox] = val ? val : "";
   }
   if (!settings.checkboxStoredRefs[checkbox]) {
     return new Set();
   } else {
-    return new Set(settings.checkboxStoredRefs[checkbox].split(",").map(r => convert(r)));
+    return new Set(settings.checkboxStoredRefs[checkbox].split(",").map(r => convert(r)).filter(a => a >= 0));
   }
 }
 

InteractiveHtmlBom/web/render.js

@@ -177,16 +177,15 @@ function getPolygonsPath(shape) {
   if (shape.svgpath) {
     shape.path2d = new Path2D(shape.svgpath);
   } else {
-    var combinedPath = new Path2D();
+    var path = new Path2D();
     for (var polygon of shape.polygons) {
-      var path = new Path2D();
-      for (var vertex of polygon) {
-        path.lineTo(...vertex)
+      path.moveTo(...polygon[0]);
+      for (var i = 1; i < polygon.length; i++) {
+        path.lineTo(...polygon[i]);
       }
       path.closePath();
-      combinedPath.addPath(path);
     }
-    shape.path2d = combinedPath;
+    shape.path2d = path;
   }
   return shape.path2d;
 }