Document Groups doesn't work after upgrade

[Eccenux]

Apache NetBeans version

Apache NetBeans 28

What happened

Document Groups doesn't seem to work after upgrade to NB28 on Windows. The list is available but doesn't open any files.

Language / Project Type / NetBeans Component

Java Maven Web application project

How to reproduce

1. In NB26 create a document group.
2. Open some files.
3. Switch to new document group.
4. Upgrade using: https://www.codelerity.com/netbeans/
5. Import settings.
6. You can restart NB just to be sure you have everything.
7. Switch to the document group you created. -> no files are opened.

Did this work correctly in an earlier version?

Apache NetBeans 26

Operating System

Windows 11 25H2

JDK

Java: 21.0.8; OpenJDK 64-Bit Server VM 21.0.8+9-LTS

Apache NetBeans packaging

Other

Anything else

No response

Are you willing to submit a pull request?

No

[Eccenux]

Seems like AppData\Roaming\NetBeans\26\config\DocumentGroups\ was not copied to v28.

To workaround this:

1. Switch to <none> group.
2. Close NB.
3. Copy NetBeans\26\config\DocumentGroups\* to NetBeans\28\config\DocumentGroups\ (replace all files).
4. Copy NetBeans\26\config\Preferences\org\netbeans\core\windows\DocumentGroups\ to NetBeans\28\config\Preferences\org\netbeans\core\windows\DocumentGroups\.

Switching groups is slow after that (I assume some config conversion is done), but surprisingly so far it works fine. I also noticed each opened group is modified (names of views are modified like on the screen below).

[mbien]

switching document groups was always fairly slow - esp when it switched between a lot of files, but I don't use them very often.

My document groups did import into NB 28 though.