Keep extra query params when focusing on a spec or suite

[finish #29578495]

src/html/HtmlReporter.js

@@ -11,6 +11,7 @@ jasmineRequire.HtmlReporter = function(j$) {
       createElement = options.createElement,
       createTextNode = options.createTextNode,
       onRaiseExceptionsClick = options.onRaiseExceptionsClick || function() {},
+      addToExistingQueryString = options.addToExistingQueryString || defaultQueryString,
       timer = options.timer || noopTimer,
       results = [],
       specsExecuted = 0,
@@ -238,7 +239,7 @@ jasmineRequire.HtmlReporter = function(j$) {
     function clearPrior() {
       // return the reporter
       var oldReporter = find('');
-      
+
       if(oldReporter) {
         getContainer().removeChild(oldReporter);
       }
@@ -277,7 +278,11 @@ jasmineRequire.HtmlReporter = function(j$) {
     }
 
     function specHref(result) {
-      return '?spec=' + encodeURIComponent(result.fullName);
+      return addToExistingQueryString('spec', encodeURIComponent(result.fullName));
+    }
+
+    function defaultQueryString(key, value) {
+      return '?' + key + '=' + value;
     }
 
     function setMenuModeTo(mode) {

src/html/QueryString.js

@@ -1,10 +1,14 @@
 jasmineRequire.QueryString = function() {
   function QueryString(options) {
 
-    this.setParam = function(key, value) {
+    this.navigateWithNewParam = function(key, value) {
+      options.getWindowLocation().search = this.fullStringWithNewParam(key, value);
+    };
+
+    this.fullStringWithNewParam = function(key, value) {
       var paramMap = queryStringToParamMap();
       paramMap[key] = value;
-      options.getWindowLocation().search = toQueryString(paramMap);
+      return toQueryString(paramMap);
     };
 
     this.getParam = function(key) {