The method from isUserInGroup from com.xpn.xwiki.api.User is using deprecated API to fetch the user's group list, instead of the new group manager API methods. Issue XWIKI-12292 open about this method is closed as won't fix with a recommendation to use the group manager API instead. Thus, one of the 2 needs to be done:
- either the method isUserInGroup is kept but marked somehow as deprecated, or javadoc is updated to mention that it has unresolved limitations and the group manager API is now recommended
- or its implementation is updated to be as correct as it can be using the latest and greatest of the APIs.
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