Cannot drop one category into another in Categories portlet

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.0.X EE
• Fix Version/s: 6.0.X EE
• Component/s: Categories, ~ [Archived] Frontend Infrastructure
• Labels:
  • QA-R
  • QA-TP
• Branch Version/s:
  6.0.x
• Backported to Branch:
  Committed
• Story Points: 2
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal-ee/pull/997

One cannot create subcategories by dragging one category into another.

Steps:
1. Go to Control Panel > Categories
2. Create or select a vocabulary with at least two categories
3. Try to drag one category into another

Result:
The dragged category cannot be dropped into the other one

Expected:
To be possible to drop one category into the other