change hash without affecting the rest of URL (#9960)

* change hash without affecting the rest of URL

Closes #9955 . Hash change currently replaces history state url with only the updated hash, ignoring the current URL (path, query parameters etc). This PR fixes the hash change method, so that it updates only the fragment (part in case of a named fragment parameter), while leaving the rest of URL untouched.

* bump the branch to try to trigger Circle CI

* use null in place of document.title

null will default to document.title

Co-authored-by: Vladimir Agafonkin <agafonkin@gmail.com>

src/ui/hash.js

@@ -132,9 +132,10 @@ class Hash {
     }
 
     _updateHashUnthrottled() {
-        const hash = this.getHashString();
+        // Replace if already present, else append the updated hash string
+        const location = window.location.href.replace(/(#.+)?$/, this.getHashString());
         try {
-            window.history.replaceState(window.history.state, '', hash);
+            window.history.replaceState(window.history.state, null, location);
         } catch (SecurityError) {
             // IE11 does not allow this if the page is within an iframe created
             // with iframe.contentWindow.document.write(...).