bug: conversion checkpoint is lost on selecting any of the facet value

fixes issue 638

tools/rum/slicer.js

@@ -311,6 +311,16 @@ export function updateState() {
   });
   url.searchParams.set('domainkey', searchParams.get('domainkey') || 'incognito');
 
+  // with the conversion spec in form of dictionary
+  // need to put it back in the url by expanding the dictionary as follows
+  // the key is appended to conversion. and there can be multiple values for the same key
+  // conversion.key=value1&conversion.key=value2
+  Object.entries(conversionSpec).forEach(([key, values]) => {
+    values.forEach((value) => {
+      url.searchParams.append(`conversion.${key}`, value);
+    });
+  });
+
   window.history.replaceState({}, '', url);
   document.dispatchEvent(new CustomEvent('urlstatechange', { detail: url }));
 }