...solved by removing the nPos member and instead calculating the index on the
fly.  The difference is that old indices were before calling std::sort in
OPropertyInfoService::getPropertyInfo() while new ones are after, but that
should probably be OK per the documentation of
com.sun.star.inspection.XObjectInspectionModel.getPropertyOrderIndex (which
appears to be the only client of that functionality).

Change-Id: Id346bb219acbdad88ec43cf46feca8c37f2c7cf4