Fixed search component not instantiating back when pressing the back button on the issue page

app/views/shared/issuable/_search_bar.html.haml

@@ -125,3 +125,13 @@
     event.preventDefault();
     Turbolinks.visit(this.action + '&' + $(this).serialize());
   });
+
+  $(document).off('page:restore').on('page:restore', function (event) {
+    if (gl.FilteredSearchManager) {
+      new gl.FilteredSearchManager();
+    }
+    Issuable.init();
+    new gl.IssuableBulkActions({
+      prefixId: 'issue_',
+    });
+  });