PDF is poorly formatted

[mutmedia]

Issue details

When saving a pdf to wallabag it is either very poorly formatted or straight unreadable. Not sure if this is a wallabag problem or if it is some external library used for converting pdf's, but it kills one use case for me which is reading and taking notes on papers.

Environment

using latest wallabag version on yunohost on a personal raspberry pi

Steps to reproduce/test case

Go to a pdf page (e.g: https://www.utilitarianism.com/nu/omelas.pdf)
Save it to wallabag
Notice that the text is very poorly formatted

[j0k3r]

We are using an external library (https://github.com/smalot/pdfparser) for that so we can't fix it.
Basically we usually extract text from the PDF as plain text because we can't keep formatting stuff when doing that.

[Kdecherf]

@mutmedia do you consider that #2655 would fix your issue?

[mutmedia]

Posted a question there regarding highlighting/annotation, but if I understand it properly, I believe it will