Double scroll bars in Watchers list

Issue Summary

Double scroll bars in Watchers list when 8 or more watchers are added.

Steps to Reproduce

1. Create a project with issues
2. Browse an issue
3. Add 8 watchers to the issue

Issue is not reproducible in Jira 8.5.0/8.5.1.
Issue is reproducible with Jira 8.5.2 and above.

Expected Results

One scroll bar per list

Actual Results

Double scroll bars within the watchers list

Workaround

• End user configurations:
  • In MacOS, switch the 'Show scroll bars' settings (System Preferences >> General) to 'When scrolling':
    
  • In Windows 10, switch the 'Automatically hide scroll bars in Windows' settings (Settings >> Easy of Access >> Display) to ON:
    

OR

• Jira system configurations:
  Include the following in Announcement Banner (Jira Administration >> System):

  <style>
  #inline-dialog-watchers .recipients {
  	max-height: none;
  }
  </style>