Merge branch '10197-multiple-assignees-avatars-scrolling-bug' into 'master'

Backport: Fixed sidebar assignees scrolling bug

See merge request gitlab-org/gitlab-ce!31932

app/assets/stylesheets/pages/issuable.scss

@@ -522,6 +522,7 @@
     }
 
     .multiple-users {
+      position: relative;
       height: 24px;
       margin-bottom: 17px;
       margin-top: 4px;