Adding a new subgroup sometimes results in the whole list of groups being hidden

[mpatas]

In JabRef 5.0, adding a new subgroup sometimes results in the whole list of groups (in groups interface) being hidden, as if all of them had been deleted. So far it looks like that happens when the group to which the subgroup is being added has many subgroups already, and the new subgroup would have to be put in a place that would not be visible without scrolling down.

After saving the file, closing JabRef and reopening it, everything goes back to normal, the created subgroup is also present.

[github-actions]

This issue has been inactive for half a year. Since JabRef is constantly evolving this issue may not be relevant any longer and it will be closed in two weeks if no further activity occurs.

As part of an effort to ensure that the JabRef team is focusing on important and valid issues, we would like to ask if you could update the issue if it still persists. This could be in the following form:

• If there has been a longer discussion, add a short summary of the most important points as a new comment (if not yet existing).
• Provide further steps or information on how to reproduce this issue.
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