Fix tests, add explanatory comment

src/browser/Linkifier.ts

@@ -89,7 +89,9 @@ export class Linkifier implements ILinkifier {
     if (this._rowsTimeoutId) {
       clearTimeout(this._rowsTimeoutId);
     }
-    this._rowsTimeoutId = window.setTimeout(() => this._linkifyRows(), Linkifier._timeBeforeLatency);
+
+    // Cannot use window.setTimeout since tests need to run in node
+    this._rowsTimeoutId = setTimeout(() => this._linkifyRows(), Linkifier._timeBeforeLatency) as any as number;
   }
 
   /**