More Useful Links in "Print entire section" Mode

[boevski]

DL;DR: Need working links in print mode.

Long version:

The idea behind the "Print entire section" feature us great. I was researching it for the purpose of PDF creation where it makes it easy to use whatever PDF converter you like, even automation, in an elegant way. Unfortunately, I found out a pretty major deficiency - it keeps the links unchanged, meaning they point to pages outside the _print page. It doesn't make a difference when printing on paper, but when printing to PDF (which, I guess, is far more common nowadays), it means loosing functionality and context. This, with the presence of broken links, makes the resulting PDF completely unfit for professional use like handing over to customers.

What would it take to redo the links so that they work within the context of the monolithic _print page?

I understand this might not be everybody's cup of tee, so it could be a configuration option.
It will require generating ids for headings that don't already have them. For the anchor links, simply dropping the URL part preceding the hash sign won't do, as multiple of the original pages might use the same ids. These will have to be replaced by autogenerated UUIDs or prefixed/suffixed with something to make them unique.