Parent folder cannot be restricted to different structure than child folder's if latter has contents

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X, 7.2.X, Master
• Fix Version/s: 7.2.10 DXP FP5, 7.2.10.2 DXP SP2, 7.2.X, 7.3.1 CE GA2, 7.3.2 CE GA3, 7.3.10 DXP GA1, Master
• Component/s: Web Content > Web Content Administration
• Labels:
  • ee-ts
  • liferay-dxp-72-sp2
  • liferay-fixpack-dxp-5-7210
• Branch Version/s:
  7.2.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/86460

Reproducing Steps

Case 1

1. Create two structures; call them str01 and str02.
2. Add a Journal folder, call it folder01.
3. Add a Journal folder, call it folder02, as a subfolder of folder01.
4. Edit folder02 and restrict its allowed structures to just str02.
5. Add a new web content based on str02, call it str02wc. (I couldn't create it based on str01 anyway.)
6. Edit folder01 and restrict its allowed structures to just str01. Save.
   Expected: The configuration can be saved, because although there's a content of a different structure (str02wc) in a subfolder, that subfolder has explicitly specified that the structure is allowed.
   Observed: The configuration cannot be saved due to the presence of str02wc in folder02. The following visual error message is shown

   Error: You cannot apply the selected structure restrictions for this folder. At least one web content references another structure.

Case 2

1. Create two structures; call them str01 and str02.
2. Add a Journal folder, call it folder01.
3. Edit folder01 and restrict its allowed structures to just str01.
4. Add a Journal folder, call it folder02, as a subfolder of folder01.
5. Edit folder02 and restrict its allowed structures to just str02.
6. Add a new web content based on str02, call it str02wc. (I couldn't create it based on str01 anyway.)
   Observed: The web content can be saved successfully even though now we have a web content based on str02 in a subfolder of folder01, which only allows str01.
7.  Edit folder01 to, say, add a description and try to save:
   Expected: The configuration can be saved,
   Observed: Same error as in Case 1, due to the presence of str02wc in folder02