Tree navigation breaks after clicking on "Load More Results" link: A node can be re-expanded any times

• Type: Technical Task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 6.0.X EE
• Fix Version/s: 6.0.X EE
• Component/s: Categories, Frontend Infrastructure
• Labels:
  • 6.0_release_notes
  • QA-R
  • QA-TP
  • alloy
  • aui
  • ee-ts
  • javascript
• Epic/Theme:
  • Escalation
• Business Value: 5
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal-ee/pull/1067

Initial steps
1. Build a portal from branch liferay-portal-ee/ee-6.0.x
2. Start clean bundle
3. Deploy category-adder-portlet-6.0.13.1.war
4. Add "Category Adder" portlet to a page
5. Click on "Add Categories"

>>> It will create

• 1 Vocabulary, called "TestVocabulary"
• 25 root categories, and each of them will have 25 subcategories

6. Go to Control Panel/Categories >>> At this point, you can see 10 categories displayed and a "Load More Results" link (check screenshot "CategoriesAdmin-Tree.is.displayed.correctly_ee-6.0.x.png"

7. Expand an arbitrary category >>> Now, you can see its subcategories and a new "Load More Results" link

Problem
8. Reload the page
9. Click on the "Load More Results" link >>> You can see the new categories, but from this point, you can expand a category again & again, until an arbitrary depth (check screenshot "CategoriesAdmin-Tree.expand.problemee.6.0.x.png"

It seems like the aui-paginator is instantiated with wrong parameters upon loading more results or somewhere we pass wrong objects as children nodes.