QDoc: Breadcrumb and next/previous page from the TOC with \generatelist

When topics are added to the TOC, \nextpage and \previouspage values and the breadcrumb navigation are generated automatically from the TOC. However, adding topics to TOC with \generatelist causes the \nextpage, \previouspage, and breadcrumb navigation to work in an unexpected way.

In other words, topics that are listed with \generatelist in the TOC have next/previouspage links to the next/previous high-level topics and the breadcrumb does not show the path to the topic (examples below).

For example, these topics in Qt Creator and Qt Design Studio docs were added to their respective TOCs with \generatelist and navigation does not work as expected:

• https://doc.qt.io/qtcreator/creator-build-example-application.html
• https://doc.qt.io/qtdesignstudio/creator-checking-code-syntax.html

I expected the navigation to work similarly if I had manually listed all the topics to the TOC. So, the breadcrumb would show the "path" to that topic. And, the \nextpage and \previouspage would link to a next/previous topic in that list.

What I expected the navigation to look like: https://doc.qt.io/qtdesignstudio/studio-3d-editor.html

It would improve usability (for the user and the writer of the docs) if the navigation worked as expected.