Open Help pages should be part of Session

I use Sessions for the different projects I work with. That is really useful. However, I noticed that the opened Help pages are not stored in the session, resulting in the situation that if I switch sessions I end up with a list of open pages that is completely irrelevant for the project I am now on, and the pages I had open for this session before are now probably gone for the same reason.

I think the opened Help pages should be stored in and restored from the session as well as the open projects and source files.