Links in "Qt XXX Reference Documentation" switch versions

When navigating to another help page that is located in another qch file, only the latest version is opened. Instead, it should use the corresponding version.

How to reproduce

• Install e.g. Qt 5.6.2, Qt 5.8.0 in online installer.
• Open Qt Creator > Help, navigate to "Qt 5.6.2 Reference Documentation > Classes"
• Click on QAbstractAnimation

The target for the link is "qthelp://org.qt-project.qtdoc.562/qtcore/qabstractanimation.html" . Still, when opened it shows up as "Qt 5.8.0 Reference Documentation".

This is arguably unexpected. While we should aim that the latest documentation is also valid for older ones, this is confusing.