Merge branch 'master' into add-feature-search-bar

package.json

@@ -85,7 +85,7 @@
     "rollup-plugin-node-resolve": "^4.0.0",
     "shelljs": "^0.8.0",
     "shx": "^0.3.0",
-    "sinon": "^7.2.4",
+    "sinon": "^7.2.6",
     "sinon-chai": "^3.1.0",
     "smash": "0.0",
     "svg-sprite": "1.5.0",

test/spec/spec_helpers.js

@@ -38,6 +38,12 @@ expect = chai.expect;
 
 window.d3 = iD.d3;   // TODO: remove
 
+// Object.getOwnPropertySymbols polyfill (For PhantomJS / IE11) - #6001
+if (!Object.getOwnPropertySymbols) {
+  Object.defineProperty(Object.prototype, 'getOwnPropertySymbols', {
+    value: function() { return []; }
+  });
+}
 
 // Array.find polyfill (For PhantomJS / IE11)
 // https://tc39.github.io/ecma262/#sec-array.prototype.find