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Currently, the xml/multiview module contains two parts - one is the synchronization framework, and one is the UI implementation for the "section view". However, the section view UI is useful also without the synchronization framework, so it should be moved to a separate module.
I suggest j2ee/sectionview as the location for the new module.
The description implies that there will be clients using the section view alone, so it seems the new module will have to provide some API. I suggest to try to separate that API with evolution in mind, so that it can become stable at some point. I know xml/multiview is not in a shape allowing it to be turned into a stable API anytime soon, so I view this issue as an opportunity to stabilize at least a part of it.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss