Merge branch '22743-issue-tooltip-will-not-disappear-going-back-to-previous-page' into 'master'

Close any open tooltips before page:fetch

## What does this MR do?

Resolve #22743 by removing any open tooltips before `page:fetch`.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

Open tooltips were never closed (could never be) in certain browsers after navigating with Turbolinks and going back.

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #22743

See merge request !6795

CHANGELOG.md

@@ -75,6 +75,7 @@ Please view this file on the master branch, on stable branches it's out of date.
   - Don't include archived projects when creating group milestones. !4940 (Jeroen Jacobs)
   - Add tag shortcut from the Commit page. !6543
   - Keep refs for each deployment
+  - Close open tooltips on page navigation (Linus Thiel)
   - Allow browsing branches that end with '.atom'
   - Log LDAP lookup errors and don't swallow unrelated exceptions. !6103 (Markus Koller)
   - Replace unique keyframes mixin with keyframe mixin with specific names (ClemMakesApps)

app/assets/javascripts/application.js

@@ -124,15 +124,11 @@
     return str.replace(/<(?:.|\n)*?>/gm, '');
   };
 
-  window.unbindEvents = function() {
-    return $(document).off('scroll');
-  };
-
   window.shiftWindow = function() {
     return scrollBy(0, -100);
   };
 
-  document.addEventListener("page:fetch", unbindEvents);
+  document.addEventListener("page:fetch", gl.utils.cleanupBeforeFetch);
 
   window.addEventListener("hashchange", shiftWindow);
 

app/assets/javascripts/lib/utils/common_utils.js

@@ -43,6 +43,14 @@
       parser.href = url;
       return parser;
     };
+
+    gl.utils.cleanupBeforeFetch = function() {
+      // Unbind scroll events
+      $(document).off('scroll');
+      // Close any open tooltips
+      $('.has-tooltip, [data-toggle="tooltip"]').tooltip('destroy');
+    };
+
     return jQuery.timefor = function(time, suffix, expiredLabel) {
       var suffixFromNow, timefor;
       if (!time) {