QtPdf: Changing between single and multipage does no update currentPage properly

When switching from multi page view to single page view, it causes the navigation to jump to page 0 (maybe that is a bug?), but current page number is not updated properly. So this behavior cannot be worked around easily by jumping to the same page as it thinks it is still the same page.

The issue can be reproduced with PDF Viewer example. Open multi page PDF file, set View -> Continuous mode, navigate to some page, then unset the Continuous mode. The UI shows the old page number, but the view is showing the first page.